use == and != to enable handling null/undefined

lib/runtime/dart/core.js

 var core;
 (function(exports) {
   'use strict';
   class Object {
     constructor() {
       var name = this.constructor.name;
       var init = this[name];
       var result = void 0;
       if (init)
         result = init.apply(this, arguments);
@@ skipping 91 matching lines @@
       if (millisecond === void 0)
         millisecond = 0;
       this[_internal$](year, month, day, hour, minute, second, millisecond, true);
     }
     now() {
       this[_now]();
     }
     static parse(formattedString) {
       let re = new RegExp('^([+-]?\\d{4,6})-?(\\d\\d)-?(\\d\\d)' + '(?:[ T](\\d\\d)(?::?(\\d\\d)(?::?(\\d\\d)(.\\d{1,6})?)?)?' + '( ?[zZ]| ?([-+])(\\d\\d)(?::?(\\d\\d))?)?)?$');
       let match = re.firstMatch(formattedString);
-      if (match !== null) {
+      if (match != null) {
         // Function parseIntOrZero: (String) → int
         function parseIntOrZero(matched) {
-          if (matched === null)
+          if (matched == null)
             return 0;
           return int.parse(matched);
         }
         // Function parseDoubleOrZero: (String) → double
         function parseDoubleOrZero(matched) {
-          if (matched === null)
+          if (matched == null)
             return 0.0;
           return double.parse(matched);
         }
         let years = int.parse(match.get(1));
         let month = int.parse(match.get(2));
         let day = int.parse(match.get(3));
         let hour = parseIntOrZero(match.get(4));
         let minute = parseIntOrZero(match.get(5));
         let second = parseIntOrZero(match.get(6));
         let addOneMillisecond = false;
         let millisecond = (dart.notNull(parseDoubleOrZero(match.get(7))) * 1000).round();
-        if (millisecond === 1000) {
+        if (millisecond == 1000) {
           addOneMillisecond = true;
           millisecond = 999;
         }
         let isUtc = false;
-        if (match.get(8) !== null) {
+        if (match.get(8) != null) {
           isUtc = true;
-          if (match.get(9) !== null) {
-            let sign = dart.equals(match.get(9), '-') ? -1 : 1;
+          if (match.get(9) != null) {
+            let sign = match.get(9) == '-' ? -1 : 1;
             let hourDifference = int.parse(match.get(10));
             let minuteDifference = parseIntOrZero(match.get(11));
             minuteDifference = 60 * dart.notNull(hourDifference);
             minute = dart.notNull(sign) * dart.notNull(minuteDifference);
           }
         }
         let millisecondsSinceEpoch = DateTime[_brokenDownDateToMillisecondsSinceEpoch](years, month, day, hour, minute, second, millisecond, isUtc);
-        if (millisecondsSinceEpoch === null) {
+        if (millisecondsSinceEpoch == null) {
           throw new FormatException("Time out of range", formattedString);
         }
         if (addOneMillisecond)
           millisecondsSinceEpoch = dart.notNull(millisecondsSinceEpoch) + 1;
         return new DateTime.fromMillisecondsSinceEpoch(millisecondsSinceEpoch, {isUtc: isUtc});
       } else {
         throw new FormatException("Invalid date format", formattedString);
       }
     }
     fromMillisecondsSinceEpoch(millisecondsSinceEpoch, opts) {
       let isUtc = opts && 'isUtc' in opts ? opts.isUtc : false;
       this.millisecondsSinceEpoch = millisecondsSinceEpoch;
       this.isUtc = isUtc;
       if (dart.notNull(millisecondsSinceEpoch.abs()) > dart.notNull(DateTime[_MAX_MILLISECONDS_SINCE_EPOCH])) {
         throw new ArgumentError(millisecondsSinceEpoch);
       }
-      if (isUtc === null)
+      if (isUtc == null)
         throw new ArgumentError(isUtc);
     }
     ['=='](other) {
       if (!dart.notNull(dart.is(other, DateTime)))
         return false;
-      return this.millisecondsSinceEpoch === dart.dload(other, 'millisecondsSinceEpoch') && this.isUtc === dart.dload(other, 'isUtc');
+      return dart.equals(this.millisecondsSinceEpoch, dart.dload(other, 'millisecondsSinceEpoch')) && dart.equals(this.isUtc, dart.dload(other, 'isUtc'));
     }
     isBefore(other) {
       return dart.notNull(this.millisecondsSinceEpoch) < dart.notNull(other.millisecondsSinceEpoch);
     }
     isAfter(other) {
       return dart.notNull(this.millisecondsSinceEpoch) > dart.notNull(other.millisecondsSinceEpoch);
     }
     isAtSameMomentAs(other) {
-      return this.millisecondsSinceEpoch === other.millisecondsSinceEpoch;
+      return this.millisecondsSinceEpoch == other.millisecondsSinceEpoch;
     }
     compareTo(other) {
       return this.millisecondsSinceEpoch.compareTo(other.millisecondsSinceEpoch);
     }
     get hashCode() {
       return this.millisecondsSinceEpoch;
     }
     toLocal() {
       if (this.isUtc) {
         return new DateTime.fromMillisecondsSinceEpoch(this.millisecondsSinceEpoch, {isUtc: false});
@@ skipping 159 matching lines @@
         onError = null;
       let source = input.trim();
       num[_parseError] = false;
       let result = int.parse(source, {onError: num[_onParseErrorInt]});
       if (!dart.notNull(num[_parseError]))
         return result;
       num[_parseError] = false;
       result = double.parse(source, num[_onParseErrorDouble]);
       if (!dart.notNull(num[_parseError]))
         return result;
-      if (onError === null)
+      if (onError == null)
         throw new FormatException(input);
       return onError(input);
     }
     static [_onParseErrorInt](_) {
       num[_parseError] = true;
       return 0;
     }
     static [_onParseErrorDouble](_) {
       num[_parseError] = true;
       return 0.0;
@@ skipping 30 matching lines @@
     ['+'](other) {
       return new Duration[_microseconds](dart.notNull(this[_duration]) + dart.notNull(other[_duration]));
     }
     ['-'](other) {
       return new Duration[_microseconds](dart.notNull(this[_duration]) - dart.notNull(other[_duration]));
     }
     ['*'](factor) {
       return new Duration[_microseconds]((dart.notNull(this[_duration]) * dart.notNull(factor)).round());
     }
     ['~/'](quotient) {
-      if (quotient === 0)
+      if (quotient == 0)
         throw new IntegerDivisionByZeroException();
       return new Duration[_microseconds]((dart.notNull(this[_duration]) / dart.notNull(quotient)).truncate());
     }
     ['<'](other) {
       return dart.notNull(this[_duration]) < dart.notNull(other[_duration]);
     }
     ['>'](other) {
       return dart.notNull(this[_duration]) > dart.notNull(other[_duration]);
     }
     ['<='](other) {
@@ skipping 16 matching lines @@
     }
     get inMilliseconds() {
       return (dart.notNull(this[_duration]) / dart.notNull(Duration.MICROSECONDS_PER_MILLISECOND)).truncate();
     }
     get inMicroseconds() {
       return this[_duration];
     }
     ['=='](other) {
       if (!dart.is(other, Duration))
         return false;
-      return this[_duration] === dart.dload(other, '_duration');
+      return dart.equals(this[_duration], dart.dload(other, '_duration'));
     }
     get hashCode() {
       return this[_duration].hashCode;
     }
     compareTo(other) {
       return this[_duration].compareTo(other[_duration]);
     }
     toString() {
       // Function sixDigits: (int) → String
       function sixDigits(n) {
@@ skipping 49 matching lines @@
   Duration.SECONDS_PER_HOUR = dart.notNull(Duration.SECONDS_PER_MINUTE) * dart.notNull(Duration.MINUTES_PER_HOUR);
   Duration.SECONDS_PER_DAY = dart.notNull(Duration.SECONDS_PER_HOUR) * dart.notNull(Duration.HOURS_PER_DAY);
   Duration.MINUTES_PER_DAY = dart.notNull(Duration.MINUTES_PER_HOUR) * dart.notNull(Duration.HOURS_PER_DAY);
   Duration.ZERO = new Duration({seconds: 0});
   let _stringToSafeString = dart.JsSymbol('_stringToSafeString');
   let _objectToString = dart.JsSymbol('_objectToString');
   class Error extends Object {
     Error() {
     }
     static safeToString(object) {
-      if (dart.notNull(dart.is(object, num)) || dart.notNull(typeof object == 'boolean') || dart.notNull(null === object)) {
+      if (dart.notNull(dart.is(object, num)) || dart.notNull(typeof object == 'boolean') || dart.notNull(null == object)) {
         return object.toString();
       }
       if (typeof object == 'string') {
         return Error[_stringToSafeString](object);
       }
       return Error[_objectToString](object);
     }
     static [_stringToSafeString](string) {
       return _js_helper.jsonEncodeNative(string);
     }
@@ skipping 38 matching lines @@
       super.Error();
     }
     notNull(name) {
       if (name === void 0)
         name = null;
       this.value(null, name, "Must not be null");
     }
     toString() {
       if (!dart.notNull(this[_hasValue])) {
         let result = "Invalid arguments(s)";
-        if (this.message !== null) {
+        if (this.message != null) {
           result = `${result}: ${this.message}`;
         }
         return result;
       }
       let nameString = "";
-      if (this.name !== null) {
+      if (this.name != null) {
         nameString = ` (${this.name})`;
       }
       return `${this.message}${nameString}: ${Error.safeToString(this.invalidValue)}`;
     }
   }
   dart.defineNamedConstructor(ArgumentError, 'value');
   dart.defineNamedConstructor(ArgumentError, 'notNull');
   class RangeError extends ArgumentError {
     RangeError(message) {
       this.start = null;
       this.end = null;
       super.ArgumentError(message);
     }
     value(value, name, message) {
       if (name === void 0)
         name = null;
       if (message === void 0)
         message = null;
       this.start = null;
       this.end = null;
-      super.value(value, name, message !== null ? message : "Value not in range");
+      super.value(value, name, message != null ? message : "Value not in range");
     }
     range(invalidValue, minValue, maxValue, name, message) {
       if (name === void 0)
         name = null;
       if (message === void 0)
         message = null;
       this.start = minValue;
       this.end = maxValue;
-      super.value(invalidValue, name, message !== null ? message : "Invalid value");
+      super.value(invalidValue, name, message != null ? message : "Invalid value");
     }
     index(index, indexable, name, message, length) {
       return new IndexError(index, indexable, name, message, length);
     }
     static checkValueInInterval(value, minValue, maxValue, name, message) {
       if (name === void 0)
         name = null;
       if (message === void 0)
         message = null;
       if (dart.notNull(value) < dart.notNull(minValue) || dart.notNull(value) > dart.notNull(maxValue)) {
         throw new RangeError.range(value, minValue, maxValue, name, message);
       }
     }
     static checkValidIndex(index, indexable, name, length, message) {
       if (name === void 0)
         name = null;
       if (length === void 0)
         length = null;
       if (message === void 0)
         message = null;
-      if (length === null)
+      if (length == null)
         length = dart.as(dart.dload(indexable, 'length'), int);
       if (dart.notNull(index) < 0 || dart.notNull(index) >= dart.notNull(length)) {
-        if (name === null)
+        if (name == null)
           name = "index";
         throw new RangeError.index(index, indexable, name, message, length);
       }
     }
     static checkValidRange(start, end, length, startName, endName, message) {
       if (startName === void 0)
         startName = null;
       if (endName === void 0)
         endName = null;
       if (message === void 0)
         message = null;
       if (dart.notNull(start) < 0 || dart.notNull(start) > dart.notNull(length)) {
-        if (startName === null)
+        if (startName == null)
           startName = "start";
         throw new RangeError.range(start, 0, length, startName, message);
       }
-      if (end !== null && (dart.notNull(end) < dart.notNull(start) || dart.notNull(end) > dart.notNull(length))) {
-        if (endName === null)
+      if (end != null && (dart.notNull(end) < dart.notNull(start) || dart.notNull(end) > dart.notNull(length))) {
+        if (endName == null)
           endName = "end";
         throw new RangeError.range(end, start, length, endName, message);
       }
     }
     static checkNotNegative(value, name, message) {
       if (name === void 0)
         name = null;
       if (message === void 0)
         message = null;
       if (dart.notNull(value) < 0)
         throw new RangeError.range(value, 0, null, name, message);
     }
     toString() {
       if (!dart.notNull(this[_hasValue]))
         return `RangeError: ${this.message}`;
       let value = Error.safeToString(this.invalidValue);
       let explanation = "";
-      if (this.start === null) {
-        if (this.end !== null) {
+      if (this.start == null) {
+        if (this.end != null) {
           explanation = `: Not less than or equal to ${this.end}`;
         }
-      } else if (this.end === null) {
+      } else if (this.end == null) {
         explanation = `: Not greater than or equal to ${this.start}`;
       } else if (dart.notNull(this.end) > dart.notNull(this.start)) {
         explanation = `: Not in range ${this.start}..${this.end}, inclusive.`;
       } else if (dart.notNull(this.end) < dart.notNull(this.start)) {
         explanation = ": Valid value range is empty";
       } else {
         explanation = `: Only valid value is ${this.start}`;
       }
       return `RangeError: ${this.message} (${value})${explanation}`;
     }
   }
   dart.defineNamedConstructor(RangeError, 'value');
   dart.defineNamedConstructor(RangeError, 'range');
   dart.defineNamedConstructor(RangeError, 'index');
   class IndexError extends ArgumentError {
     IndexError(invalidValue, indexable, name, message, length) {
       if (name === void 0)
         name = null;
       if (message === void 0)
         message = null;
       if (length === void 0)
         length = null;
       this.indexable = indexable;
-      this.length = dart.as(length !== null ? length : dart.dload(indexable, 'length'), int);
-      super.value(invalidValue, name, message !== null ? message : "Index out of range");
+      this.length = dart.as(length != null ? length : dart.dload(indexable, 'length'), int);
+      super.value(invalidValue, name, message != null ? message : "Index out of range");
     }
     get start() {
       return 0;
     }
     get end() {
       return dart.notNull(this.length) - 1;
     }
     toString() {
       dart.assert(this[_hasValue]);
       let target = Error.safeToString(this.indexable);
@@ skipping 31 matching lines @@
       this[_receiver] = receiver;
       this[_memberName] = memberName;
       this[_arguments] = positionalArguments;
       this[_namedArguments] = namedArguments;
       this[_existingArgumentNames] = existingArgumentNames;
       super.Error();
     }
     toString() {
       let sb = new StringBuffer();
       let i = 0;
-      if (this[_arguments] !== null) {
+      if (this[_arguments] != null) {
         for (; dart.notNull(i) < dart.notNull(this[_arguments].length); i = dart.notNull(i) + 1) {
           if (dart.notNull(i) > 0) {
             sb.write(", ");
           }
           sb.write(Error.safeToString(this[_arguments].get(i)));
         }
       }
-      if (this[_namedArguments] !== null) {
+      if (this[_namedArguments] != null) {
         this[_namedArguments].forEach(((key, value) => {
           if (dart.notNull(i) > 0) {
             sb.write(", ");
           }
           sb.write(_symbolToString(key));
           sb.write(": ");
           sb.write(Error.safeToString(value));
           i = dart.notNull(i) + 1;
         }).bind(this));
       }
-      if (this[_existingArgumentNames] === null) {
+      if (this[_existingArgumentNames] == null) {
         return `NoSuchMethodError : method not found: '${this[_memberName]}'\n` + `Receiver: ${Error.safeToString(this[_receiver])}\n` + `Arguments: [${sb}]`;
       } else {
         let actualParameters = sb.toString();
         sb = new StringBuffer();
         for (let i = 0; dart.notNull(i) < dart.notNull(this[_existingArgumentNames].length); i = dart.notNull(i) + 1) {
           if (dart.notNull(i) > 0) {
             sb.write(", ");
           }
           sb.write(this[_existingArgumentNames].get(i));
         }
@@ skipping 12 matching lines @@
     }
   }
   class UnimplementedError extends Error {
     UnimplementedError(message) {
       if (message === void 0)
         message = null;
       this.message = message;
       super.Error();
     }
     toString() {
-      return this.message !== null ? `UnimplementedError: ${this.message}` : "UnimplementedError";
+      return this.message != null ? `UnimplementedError: ${this.message}` : "UnimplementedError";
     }
   }
   class StateError extends Error {
     StateError(message) {
       this.message = message;
       super.Error();
     }
     toString() {
       return `Bad state: ${this.message}`;
     }
   }
   class ConcurrentModificationError extends Error {
     ConcurrentModificationError(modifiedObject) {
       if (modifiedObject === void 0)
         modifiedObject = null;
       this.modifiedObject = modifiedObject;
       super.Error();
     }
     toString() {
-      if (this.modifiedObject === null) {
+      if (this.modifiedObject == null) {
         return "Concurrent modification during iteration.";
       }
       return "Concurrent modification during iteration: " + `${Error.safeToString(this.modifiedObject)}.`;
     }
   }
   class OutOfMemoryError extends Object {
     OutOfMemoryError() {
     }
     toString() {
       return "Out of Memory";
@@ skipping 13 matching lines @@
     }
   }
   class CyclicInitializationError extends Error {
     CyclicInitializationError(variableName) {
       if (variableName === void 0)
         variableName = null;
       this.variableName = variableName;
       super.Error();
     }
     toString() {
-      return this.variableName === null ? "Reading static variable during its initialization" : `Reading static variable '${this.variableName}' during its initialization`;
+      return this.variableName == null ? "Reading static variable during its initialization" : `Reading static variable '${this.variableName}' during its initialization`;
     }
   }
   class Exception extends Object {
     Exception(message) {
       if (message === void 0)
         message = null;
       return new _ExceptionImplementation(message);
     }
   }
   class _ExceptionImplementation extends Object {
     _ExceptionImplementation(message) {
       if (message === void 0)
         message = null;
       this.message = message;
     }
     toString() {
-      if (this.message === null)
+      if (this.message == null)
         return "Exception";
       return `Exception: ${this.message}`;
     }
   }
   class FormatException extends Object {
     FormatException(message, source, offset) {
       if (message === void 0)
         message = "";
       if (source === void 0)
         source = null;
       if (offset === void 0)
         offset = -1;
       this.message = message;
       this.source = source;
       this.offset = offset;
     }
     toString() {
       let report = "FormatException";
-      if (dart.notNull(this.message !== null) && dart.notNull(!dart.equals("", this.message))) {
+      if (dart.notNull(this.message != null) && dart.notNull("" != this.message)) {
         report = `${report}: ${this.message}`;
       }
       let offset = this.offset;
       if (!(typeof this.source == 'string')) {
-        if (offset !== -1) {
+        if (offset != -1) {
           report = ` (at offset ${offset})`;
         }
         return report;
       }
-      if (offset !== -1 && (dart.notNull(offset) < 0 || offset['>'](dart.dload(this.source, 'length')))) {
+      if (offset != -1 && (dart.notNull(offset) < 0 || offset['>'](dart.dload(this.source, 'length')))) {
         offset = -1;
       }
-      if (offset === -1) {
+      if (offset == -1) {
         let source = dart.as(this.source, String);
         if (dart.notNull(source.length) > 78) {
           source = String['+'](source.substring(0, 75), "...");
         }
         return `${report}\n${source}`;
       }
       let lineNum = 1;
       let lineStart = 0;
       let lastWasCR = null;
       for (let i = 0; dart.notNull(i) < dart.notNull(offset); i = dart.notNull(i) + 1) {
         let char = dart.as(dart.dinvoke(this.source, 'codeUnitAt', i), int);
-        if (char === 10) {
-          if (lineStart !== i || !dart.notNull(lastWasCR)) {
+        if (char == 10) {
+          if (lineStart != i || !dart.notNull(lastWasCR)) {
             lineNum = dart.notNull(lineNum) + 1;
           }
           lineStart = dart.notNull(i) + 1;
           lastWasCR = false;
-        } else if (char === 13) {
+        } else if (char == 13) {
           lineNum = dart.notNull(lineNum) + 1;
           lineStart = dart.notNull(i) + 1;
           lastWasCR = true;
         }
       }
       if (dart.notNull(lineNum) > 1) {
         report = ` (at line ${lineNum}, character ${dart.notNull(offset) - dart.notNull(lineStart) + 1})\n`;
       } else {
         report = ` (at character ${dart.notNull(offset) + 1})\n`;
       }
       let lineEnd = dart.as(dart.dload(this.source, 'length'), int);
       for (let i = offset; i['<'](dart.dload(this.source, 'length')); i = dart.notNull(i) + 1) {
         let char = dart.as(dart.dinvoke(this.source, 'codeUnitAt', i), int);
-        if (char === 10 || char === 13) {
+        if (char == 10 || char == 13) {
           lineEnd = i;
           break;
         }
       }
       let length = dart.notNull(lineEnd) - dart.notNull(lineStart);
       let start = lineStart;
       let end = lineEnd;
       let prefix = "";
       let postfix = "";
       if (dart.notNull(length) > 78) {
@@ skipping 31 matching lines @@
       Expando(name) {
         if (name === void 0)
           name = null;
         this.name = name;
       }
       toString() {
         return `Expando:${this.name}`;
       }
       get(object) {
         let values = _js_helper.Primitives.getProperty(object, Expando[_EXPANDO_PROPERTY_NAME]);
-        return dart.as(values === null ? null : _js_helper.Primitives.getProperty(values, this[_getKey]()), T);
+        return dart.as(values == null ? null : _js_helper.Primitives.getProperty(values, this[_getKey]()), T);
       }
       set(object, value) {
         let values = _js_helper.Primitives.getProperty(object, Expando[_EXPANDO_PROPERTY_NAME]);
-        if (values === null) {
+        if (values == null) {
           values = new Object();
           _js_helper.Primitives.setProperty(object, Expando[_EXPANDO_PROPERTY_NAME], values);
         }
         _js_helper.Primitives.setProperty(values, this[_getKey](), value);
       }
       [_getKey]() {
         let key = dart.as(_js_helper.Primitives.getProperty(this, Expando[_KEY_PROPERTY_NAME]), String);
-        if (key === null) {
+        if (key == null) {
           key = `expando$key$${((x) => Expando[_keyCount] = dart.notNull(x) + 1, x)(Expando[_keyCount])}`;
           _js_helper.Primitives.setProperty(this, Expando[_KEY_PROPERTY_NAME], key);
         }
         return key;
       }
     }
     Expando._KEY_PROPERTY_NAME = 'expando$key';
     Expando._EXPANDO_PROPERTY_NAME = 'expando$values';
     Expando._keyCount = 0;
     return Expando;
   });
   let Expando = Expando$(dart.dynamic);
   let _toMangledNames = dart.JsSymbol('_toMangledNames');
   class Function extends Object {
     static apply(f, positionalArguments, namedArguments) {
       if (namedArguments === void 0)
         namedArguments = null;
-      return _js_helper.Primitives.applyFunction(f, positionalArguments, namedArguments === null ? null : Function[_toMangledNames](namedArguments));
+      return _js_helper.Primitives.applyFunction(f, positionalArguments, namedArguments == null ? null : Function[_toMangledNames](namedArguments));
     }
     static [_toMangledNames](namedArguments) {
       let result = dart.as(dart.map(), Map$(String, dynamic));
       namedArguments.forEach(dart.closureWrap((symbol, value) => {
         result.set(_symbolToString(dart.as(symbol, Symbol)), value);
       }, "(Symbol, dynamic) → void"));
       return result;
     }
   }
   // Function identical: (Object, Object) → bool
@@ skipping 55 matching lines @@
   let Iterable = Iterable$(dart.dynamic);
   let _end = dart.JsSymbol('_end');
   let _start = dart.JsSymbol('_start');
   let _generator = dart.JsSymbol('_generator');
   let _id = dart.JsSymbol('_id');
   let _GeneratorIterable$ = dart.generic(function(E) {
     class _GeneratorIterable extends collection.IterableBase$(E) {
       _GeneratorIterable(end$, generator) {
         this[_end] = end$;
         this[_start] = 0;
-        this[_generator] = dart.as(generator !== null ? generator : _GeneratorIterable[_id], _Generator);
+        this[_generator] = dart.as(generator != null ? generator : _GeneratorIterable[_id], _Generator);
         super.IterableBase();
       }
       slice(start$, end$, generator$) {
         this[_start] = start$;
         this[_end] = end$;
         this[_generator] = generator$;
         super.IterableBase();
       }
       get iterator() {
         return new _GeneratorIterator(this[_start], this[_end], this[_generator]);
       }
       get length() {
         return dart.notNull(this[_end]) - dart.notNull(this[_start]);
       }
       skip(count) {
         RangeError.checkNotNegative(count, "count");
-        if (count === 0)
+        if (count == 0)
           return this;
         let newStart = dart.notNull(this[_start]) + dart.notNull(count);
         if (dart.notNull(newStart) >= dart.notNull(this[_end]))
           return new _internal.EmptyIterable();
         return new _GeneratorIterable.slice(newStart, this[_end], this[_generator]);
       }
       take(count) {
         RangeError.checkNotNegative(count, "count");
-        if (count === 0)
+        if (count == 0)
           return new _internal.EmptyIterable();
         let newEnd = dart.notNull(this[_start]) + dart.notNull(count);
         if (dart.notNull(newEnd) >= dart.notNull(this[_end]))
           return this;
         return new _GeneratorIterable.slice(this[_start], newEnd, this[_generator]);
       }
       static [_id](n) {
         return n;
       }
     }
@@ skipping 38 matching lines @@
     class Iterator extends Object {
     }
     return Iterator;
   });
   let Iterator = Iterator$(dart.dynamic);
   let List$ = dart.generic(function(E) {
     class List extends Object {
       List(length) {
         if (length === void 0)
           length = new _ListConstructorSentinel();
-        if (length === new _ListConstructorSentinel()) {
+        if (dart.equals(length, new _ListConstructorSentinel())) {
           return new _interceptors.JSArray.emptyGrowable();
         }
         return new _interceptors.JSArray.fixed(length);
       }
       filled(length, fill) {
         let result = new _interceptors.JSArray.fixed(length);
-        if (length !== 0 && dart.notNull(fill !== null)) {
+        if (length != 0 && dart.notNull(fill != null)) {
           for (let i = 0; dart.notNull(i) < dart.notNull(result.length); i = dart.notNull(i) + 1) {
             result.set(i, fill);
           }
         }
         return dart.as(result, List$(E));
       }
       from(elements, opts) {
         let growable = opts && 'growable' in opts ? opts.growable : true;
         return null;
       }
@@ skipping 53 matching lines @@
     toString() {
       return "null";
     }
   }
   dart.defineNamedConstructor(Null, _uninstantiable);
   class Pattern extends Object {
   }
   // Function print: (Object) → void
   function print(object) {
     let line = `${object}`;
-    if (_internal.printToZone === null) {
+    if (_internal.printToZone == null) {
       _internal.printToConsole(line);
     } else {
       dart.dinvokef(_internal.printToZone, line);
     }
   }
   class Match extends Object {
   }
   class RegExp extends Object {
     RegExp(source, opts) {
       let multiLine = opts && 'multiLine' in opts ? opts.multiLine : false;
@@ skipping 34 matching lines @@
       return Stopwatch[_frequency];
     }
     Stopwatch() {
       this[_start] = null;
       this[_stop] = null;
       Stopwatch[_initTicker]();
     }
     start() {
       if (this.isRunning)
         return;
-      if (this[_start] === null) {
+      if (this[_start] == null) {
         this[_start] = Stopwatch[_now]();
       } else {
         this[_start] = dart.notNull(Stopwatch[_now]()) - (dart.notNull(this[_stop]) - dart.notNull(this[_start]));
         this[_stop] = null;
       }
     }
     stop() {
       if (!dart.notNull(this.isRunning))
         return;
       this[_stop] = Stopwatch[_now]();
     }
     reset() {
-      if (this[_start] === null)
+      if (this[_start] == null)
         return;
       this[_start] = Stopwatch[_now]();
-      if (this[_stop] !== null) {
+      if (this[_stop] != null) {
         this[_stop] = this[_start];
       }
     }
     get elapsedTicks() {
-      if (this[_start] === null) {
+      if (this[_start] == null) {
         return 0;
       }
-      return this[_stop] === null ? dart.notNull(Stopwatch[_now]()) - dart.notNull(this[_start]) : dart.notNull(this[_stop]) - dart.notNull(this[_start]);
+      return this[_stop] == null ? dart.notNull(Stopwatch[_now]()) - dart.notNull(this[_start]) : dart.notNull(this[_stop]) - dart.notNull(this[_start]);
     }
     get elapsed() {
       return new Duration({microseconds: this.elapsedMicroseconds});
     }
     get elapsedMicroseconds() {
       return (dart.notNull(this.elapsedTicks) * 1000000 / dart.notNull(this.frequency)).truncate();
     }
     get elapsedMilliseconds() {
       return (dart.notNull(this.elapsedTicks) * 1000 / dart.notNull(this.frequency)).truncate();
     }
     get isRunning() {
-      return this[_start] !== null && this[_stop] === null;
+      return this[_start] != null && this[_stop] == null;
     }
     static [_initTicker]() {
       _js_helper.Primitives.initTicker();
       Stopwatch[_frequency] = _js_helper.Primitives.timerFrequency;
     }
     static [_now]() {
       return dart.as(dart.dinvoke(_js_helper.Primitives, 'timerTicks'), int);
     }
   }
   Stopwatch._frequency = null;
   let _stringFromIterable = dart.JsSymbol('_stringFromIterable');
   class String extends Object {
     fromCharCodes(charCodes, start, end) {
       if (start === void 0)
         start = 0;
       if (end === void 0)
         end = null;
       if (!dart.is(charCodes, _interceptors.JSArray)) {
         return String[_stringFromIterable](charCodes, start, end);
       }
       let list = dart.as(charCodes, List);
       let len = list.length;
       if (dart.notNull(start) < 0 || dart.notNull(start) > dart.notNull(len)) {
         throw new RangeError.range(start, 0, len);
       }
-      if (end === null) {
+      if (end == null) {
         end = len;
       } else if (dart.notNull(end) < dart.notNull(start) || dart.notNull(end) > dart.notNull(len)) {
         throw new RangeError.range(end, start, len);
       }
       if (dart.notNull(start) > 0 || dart.notNull(end) < dart.notNull(len)) {
         list = list.sublist(start, end);
       }
       return _js_helper.Primitives.stringFromCharCodes(list);
     }
     fromCharCode(charCode) {
       return _js_helper.Primitives.stringFromCharCode(charCode);
     }
     fromEnvironment(name, opts) {
       let defaultValue = opts && 'defaultValue' in opts ? opts.defaultValue : null;
       throw new UnsupportedError('String.fromEnvironment can only be used as a const constructor');
     }
     static [_stringFromIterable](charCodes, start, end) {
       if (dart.notNull(start) < 0)
         throw new RangeError.range(start, 0, charCodes.length);
-      if (end !== null && dart.notNull(end) < dart.notNull(start)) {
+      if (end != null && dart.notNull(end) < dart.notNull(start)) {
         throw new RangeError.range(end, start, charCodes.length);
       }
       let it = charCodes.iterator;
       for (let i = 0; dart.notNull(i) < dart.notNull(start); i = dart.notNull(i) + 1) {
         if (!dart.notNull(it.moveNext())) {
           throw new RangeError.range(start, 0, i);
         }
       }
       let list = new List.from([]);
-      if (end === null) {
+      if (end == null) {
         while (it.moveNext())
           list.add(it.current);
       } else {
         for (let i = start; dart.notNull(i) < dart.notNull(end); i = dart.notNull(i) + 1) {
           if (!dart.notNull(it.moveNext())) {
             throw new RangeError.range(end, start, i);
           }
           list.add(it.current);
         }
       }
       return _js_helper.Primitives.stringFromCharCodes(list);
     }
   }
   dart.defineNamedConstructor(String, 'fromCharCodes');
   dart.defineNamedConstructor(String, 'fromCharCode');
   dart.defineNamedConstructor(String, 'fromEnvironment');
   dart.defineLazyClass(exports, {
     get Runes() {
       class Runes extends collection.IterableBase$(int) {
         Runes(string) {
           this.string = string;
           super.IterableBase();
         }
         get iterator() {
           return new RuneIterator(this.string);
         }
         get last() {
-          if (this.string.length === 0) {
+          if (this.string.length == 0) {
             throw new StateError('No elements.');
           }
           let length = this.string.length;
           let code = this.string.codeUnitAt(dart.notNull(length) - 1);
           if (dart.notNull(_isTrailSurrogate(code)) && dart.notNull(this.string.length) > 1) {
             let previousCode = this.string.codeUnitAt(dart.notNull(length) - 2);
             if (_isLeadSurrogate(previousCode)) {
               return _combineSurrogatePair(previousCode, code);
             }
           }
           return code;
         }
       }
       return Runes;
     }
   });
   // Function _isLeadSurrogate: (int) → bool
   function _isLeadSurrogate(code) {
-    return (dart.notNull(code) & 64512) === 55296;
+    return (dart.notNull(code) & 64512) == 55296;
   }
   // Function _isTrailSurrogate: (int) → bool
   function _isTrailSurrogate(code) {
-    return (dart.notNull(code) & 64512) === 56320;
+    return (dart.notNull(code) & 64512) == 56320;
   }
   // Function _combineSurrogatePair: (int, int) → int
   function _combineSurrogatePair(start, end) {
     return 65536 + ((dart.notNull(start) & 1023) << 10) + (dart.notNull(end) & 1023);
   }
   let _position = dart.JsSymbol('_position');
   let _nextPosition = dart.JsSymbol('_nextPosition');
   let _currentCodePoint = dart.JsSymbol('_currentCodePoint');
   let _checkSplitSurrogate = dart.JsSymbol('_checkSplitSurrogate');
   class RuneIterator extends Object {
@@ skipping 10 matching lines @@
       this[_currentCodePoint] = null;
       RangeError.checkValueInInterval(index, 0, string.length);
       this[_checkSplitSurrogate](index);
     }
     [_checkSplitSurrogate](index) {
       if (dart.notNull(index) > 0 && dart.notNull(index) < dart.notNull(this.string.length) && dart.notNull(_isLeadSurrogate(this.string.codeUnitAt(dart.notNull(index) - 1))) && dart.notNull(_isTrailSurrogate(this.string.codeUnitAt(index)))) {
         throw new ArgumentError(`Index inside surrogate pair: ${index}`);
       }
     }
     get rawIndex() {
-      return this[_position] !== this[_nextPosition] ? this[_position] : null;
+      return this[_position] != this[_nextPosition] ? this[_position] : null;
     }
     set rawIndex(rawIndex) {
       RangeError.checkValidIndex(rawIndex, this.string, "rawIndex");
       this.reset(rawIndex);
       this.moveNext();
     }
     reset(rawIndex) {
       if (rawIndex === void 0)
         rawIndex = 0;
       RangeError.checkValueInInterval(rawIndex, 0, this.string.length, "rawIndex");
       this[_checkSplitSurrogate](rawIndex);
       this[_position] = this[_nextPosition] = rawIndex;
       this[_currentCodePoint] = null;
     }
     get current() {
       return this[_currentCodePoint];
     }
     get currentSize() {
       return dart.notNull(this[_nextPosition]) - dart.notNull(this[_position]);
     }
     get currentAsString() {
-      if (this[_position] === this[_nextPosition])
+      if (this[_position] == this[_nextPosition])
         return null;
-      if (dart.notNull(this[_position]) + 1 === this[_nextPosition])
+      if (dart.notNull(this[_position]) + 1 == this[_nextPosition])
         return this.string.get(this[_position]);
       return this.string.substring(this[_position], this[_nextPosition]);
     }
     moveNext() {
       this[_position] = this[_nextPosition];
-      if (this[_position] === this.string.length) {
+      if (this[_position] == this.string.length) {
         this[_currentCodePoint] = null;
         return false;
       }
       let codeUnit = this.string.codeUnitAt(this[_position]);
       let nextPosition = dart.notNull(this[_position]) + 1;
       if (dart.notNull(_isLeadSurrogate(codeUnit)) && dart.notNull(nextPosition) < dart.notNull(this.string.length)) {
         let nextCodeUnit = this.string.codeUnitAt(nextPosition);
         if (_isTrailSurrogate(nextCodeUnit)) {
           this[_nextPosition] = dart.notNull(nextPosition) + 1;
           this[_currentCodePoint] = _combineSurrogatePair(codeUnit, nextCodeUnit);
           return true;
         }
       }
       this[_nextPosition] = nextPosition;
       this[_currentCodePoint] = codeUnit;
       return true;
     }
     movePrevious() {
       this[_nextPosition] = this[_position];
-      if (this[_position] === 0) {
+      if (this[_position] == 0) {
         this[_currentCodePoint] = null;
         return false;
       }
       let position = dart.notNull(this[_position]) - 1;
       let codeUnit = this.string.codeUnitAt(position);
       if (dart.notNull(_isTrailSurrogate(codeUnit)) && dart.notNull(position) > 0) {
         let prevCodeUnit = this.string.codeUnitAt(dart.notNull(position) - 1);
         if (_isLeadSurrogate(prevCodeUnit)) {
           this[_position] = dart.notNull(position) - 1;
           this[_currentCodePoint] = _combineSurrogatePair(prevCodeUnit, codeUnit);
@@ skipping 11 matching lines @@
   class StringBuffer extends Object {
     StringBuffer(content) {
       if (content === void 0)
         content = "";
       this[_contents] = `${content}`;
     }
     get length() {
       return this[_contents].length;
     }
     get isEmpty() {
-      return this.length === 0;
+      return this.length == 0;
     }
     get isNotEmpty() {
       return !dart.notNull(this.isEmpty);
     }
     write(obj) {
       this[_writeString](`${obj}`);
     }
     writeCharCode(charCode) {
       this[_writeString](new String.fromCharCode(charCode));
     }
@@ skipping 121 matching lines @@
       if (!dart.notNull(this.hasAuthority))
         return "";
       let sb = new StringBuffer();
       this[_writeAuthority](sb);
       return sb.toString();
     }
     get userInfo() {
       return this[_userInfo];
     }
     get host() {
-      if (this[_host] === null)
+      if (this[_host] == null)
         return "";
       if (this[_host].startsWith('[')) {
         return this[_host].substring(1, dart.notNull(this[_host].length) - 1);
       }
       return this[_host];
     }
     get port() {
-      if (this[_port] === null)
+      if (this[_port] == null)
         return Uri[_defaultPort](this.scheme);
       return this[_port];
     }
     static [_defaultPort](scheme) {
-      if (dart.equals(scheme, "http"))
+      if (scheme == "http")
         return 80;
-      if (dart.equals(scheme, "https"))
+      if (scheme == "https")
         return 443;
       return 0;
     }
     get path() {
       return this[_path];
     }
     get query() {
-      return this[_query] === null ? "" : this[_query];
+      return this[_query] == null ? "" : this[_query];
     }
     get fragment() {
-      return this[_fragment] === null ? "" : this[_fragment];
+      return this[_fragment] == null ? "" : this[_fragment];
     }
     static parse(uri) {
       // Function isRegName: (int) → bool
       function isRegName(ch) {
         return dart.notNull(ch) < 128 && dart.notNull(!dart.equals(dart.dbinary(Uri[_regNameTable].get(dart.notNull(ch) >> 4), '&', 1 << (dart.notNull(ch) & 15)), 0));
       }
       let EOI = -1;
       let scheme = "";
       let userinfo = "";
       let host = null;
       let port = null;
       let path = null;
       let query = null;
       let fragment = null;
       let index = 0;
       let pathStart = 0;
       let char = EOI;
       // Function parseAuth: () → void
       function parseAuth() {
-        if (index === uri.length) {
+        if (index == uri.length) {
           char = EOI;
           return;
         }
         let authStart = index;
         let lastColon = -1;
         let lastAt = -1;
         char = uri.codeUnitAt(index);
         while (dart.notNull(index) < dart.notNull(uri.length)) {
           char = uri.codeUnitAt(index);
-          if (char === Uri[_SLASH] || char === Uri[_QUESTION] || char === Uri[_NUMBER_SIGN]) {
+          if (char == Uri[_SLASH] || char == Uri[_QUESTION] || char == Uri[_NUMBER_SIGN]) {
             break;
           }
-          if (char === Uri[_AT_SIGN]) {
+          if (char == Uri[_AT_SIGN]) {
             lastAt = index;
             lastColon = -1;
-          } else if (char === Uri[_COLON]) {
+          } else if (char == Uri[_COLON]) {
             lastColon = index;
-          } else if (char === Uri[_LEFT_BRACKET]) {
+          } else if (char == Uri[_LEFT_BRACKET]) {
             lastColon = -1;
             let endBracket = uri.indexOf(']', dart.notNull(index) + 1);
-            if (endBracket === -1) {
+            if (endBracket == -1) {
               index = uri.length;
               char = EOI;
               break;
             } else {
               index = endBracket;
             }
           }
           index = dart.notNull(index) + 1;
           char = EOI;
         }
@@ skipping 23 matching lines @@
           char = uri.codeUnitAt(index);
         }
       }
       let NOT_IN_PATH = 0;
       let IN_PATH = 1;
       let ALLOW_AUTH = 2;
       let state = NOT_IN_PATH;
       let i = index;
       while (dart.notNull(i) < dart.notNull(uri.length)) {
         char = uri.codeUnitAt(i);
-        if (char === Uri[_QUESTION] || char === Uri[_NUMBER_SIGN]) {
+        if (char == Uri[_QUESTION] || char == Uri[_NUMBER_SIGN]) {
           state = NOT_IN_PATH;
           break;
         }
-        if (char === Uri[_SLASH]) {
-          state = i === 0 ? ALLOW_AUTH : IN_PATH;
+        if (char == Uri[_SLASH]) {
+          state = i == 0 ? ALLOW_AUTH : IN_PATH;
           break;
         }
-        if (char === Uri[_COLON]) {
-          if (i === 0)
+        if (char == Uri[_COLON]) {
+          if (i == 0)
             Uri[_fail](uri, 0, "Invalid empty scheme");
           scheme = Uri[_makeScheme](uri, i);
           i = dart.notNull(i) + 1;
           pathStart = i;
-          if (i === uri.length) {
+          if (i == uri.length) {
             char = EOI;
             state = NOT_IN_PATH;
           } else {
             char = uri.codeUnitAt(i);
-            if (char === Uri[_QUESTION] || char === Uri[_NUMBER_SIGN]) {
+            if (char == Uri[_QUESTION] || char == Uri[_NUMBER_SIGN]) {
               state = NOT_IN_PATH;
-            } else if (char === Uri[_SLASH]) {
+            } else if (char == Uri[_SLASH]) {
               state = ALLOW_AUTH;
             } else {
               state = IN_PATH;
             }
           }
           break;
         }
         i = dart.notNull(i) + 1;
         char = EOI;
       }
       index = i;
-      if (state === ALLOW_AUTH) {
-        dart.assert(char === Uri[_SLASH]);
+      if (state == ALLOW_AUTH) {
+        dart.assert(char == Uri[_SLASH]);
         index = dart.notNull(index) + 1;
-        if (index === uri.length) {
+        if (index == uri.length) {
           char = EOI;
           state = NOT_IN_PATH;
         } else {
           char = uri.codeUnitAt(index);
-          if (char === Uri[_SLASH]) {
+          if (char == Uri[_SLASH]) {
             index = dart.notNull(index) + 1;
             parseAuth();
             pathStart = index;
           }
-          if (char === Uri[_QUESTION] || char === Uri[_NUMBER_SIGN] || char === EOI) {
+          if (char == Uri[_QUESTION] || char == Uri[_NUMBER_SIGN] || char == EOI) {
             state = NOT_IN_PATH;
           } else {
             state = IN_PATH;
           }
         }
       }
-      dart.assert(state === IN_PATH || state === NOT_IN_PATH);
-      if (state === IN_PATH) {
+      dart.assert(state == IN_PATH || state == NOT_IN_PATH);
+      if (state == IN_PATH) {
         while ((index = dart.notNull(index) + 1) < dart.notNull(uri.length)) {
           char = uri.codeUnitAt(index);
-          if (char === Uri[_QUESTION] || char === Uri[_NUMBER_SIGN]) {
+          if (char == Uri[_QUESTION] || char == Uri[_NUMBER_SIGN]) {
             break;
           }
           char = EOI;
         }
         state = NOT_IN_PATH;
       }
-      dart.assert(state === NOT_IN_PATH);
-      let isFile = dart.equals(scheme, "file");
-      let ensureLeadingSlash = host !== null;
+      dart.assert(state == NOT_IN_PATH);
+      let isFile = scheme == "file";
+      let ensureLeadingSlash = host != null;
       path = Uri[_makePath](uri, pathStart, index, null, ensureLeadingSlash, isFile);
-      if (char === Uri[_QUESTION]) {
+      if (char == Uri[_QUESTION]) {
         let numberSignIndex = uri.indexOf('#', dart.notNull(index) + 1);
         if (dart.notNull(numberSignIndex) < 0) {
           query = Uri[_makeQuery](uri, dart.notNull(index) + 1, uri.length, null);
         } else {
           query = Uri[_makeQuery](uri, dart.notNull(index) + 1, numberSignIndex, null);
           fragment = Uri[_makeFragment](uri, dart.notNull(numberSignIndex) + 1, uri.length);
         }
-      } else if (char === Uri[_NUMBER_SIGN]) {
+      } else if (char == Uri[_NUMBER_SIGN]) {
         fragment = Uri[_makeFragment](uri, dart.notNull(index) + 1, uri.length);
       }
       return new Uri[_internal$](scheme, userinfo, host, port, path, query, fragment);
     }
     static [_fail](uri, index, message) {
       throw new FormatException(message, uri, index);
     }
     [_internal$](scheme, userInfo$, host$, port$, path$, query$, fragment$) {
       this.scheme = scheme;
       this[_userInfo] = userInfo$;
@@ skipping 11 matching lines @@
       let host = opts && 'host' in opts ? opts.host : null;
       let port = opts && 'port' in opts ? opts.port : null;
       let path = opts && 'path' in opts ? opts.path : null;
       let pathSegments = opts && 'pathSegments' in opts ? opts.pathSegments : null;
       let query = opts && 'query' in opts ? opts.query : null;
       let queryParameters = opts && 'queryParameters' in opts ? opts.queryParameters : null;
       let fragment = opts && 'fragment' in opts ? opts.fragment : null;
       scheme = Uri[_makeScheme](scheme, Uri[_stringOrNullLength](scheme));
       userInfo = Uri[_makeUserInfo](userInfo, 0, Uri[_stringOrNullLength](userInfo));
       host = Uri[_makeHost](host, 0, Uri[_stringOrNullLength](host), false);
-      if (dart.equals(query, ""))
+      if (query == "")
         query = null;
       query = Uri[_makeQuery](query, 0, Uri[_stringOrNullLength](query), queryParameters);
       fragment = Uri[_makeFragment](fragment, 0, Uri[_stringOrNullLength](fragment));
       port = Uri[_makePort](port, scheme);
-      let isFile = dart.equals(scheme, "file");
-      if (dart.notNull(host === null) && (dart.notNull(userInfo.isNotEmpty) || port !== null || dart.notNull(isFile))) {
+      let isFile = scheme == "file";
+      if (dart.notNull(host == null) && (dart.notNull(userInfo.isNotEmpty) || port != null || dart.notNull(isFile))) {
         host = "";
       }
-      let ensureLeadingSlash = host !== null;
+      let ensureLeadingSlash = host != null;
       path = Uri[_makePath](path, 0, Uri[_stringOrNullLength](path), pathSegments, ensureLeadingSlash, isFile);
       return new Uri[_internal$](scheme, userInfo, host, port, path, query, fragment);
     }
     http(authority, unencodedPath, queryParameters) {
       if (queryParameters === void 0)
         queryParameters = null;
       return Uri[_makeHttpUri]("http", authority, unencodedPath, queryParameters);
     }
     https(authority, unencodedPath, queryParameters) {
       if (queryParameters === void 0)
         queryParameters = null;
       return Uri[_makeHttpUri]("https", authority, unencodedPath, queryParameters);
     }
     static [_makeHttpUri](scheme, authority, unencodedPath, queryParameters) {
       let userInfo = "";
       let host = null;
       let port = null;
-      if (dart.notNull(authority !== null) && dart.notNull(authority.isNotEmpty)) {
+      if (dart.notNull(authority != null) && dart.notNull(authority.isNotEmpty)) {
         let hostStart = 0;
         let hasUserInfo = false;
         for (let i = 0; dart.notNull(i) < dart.notNull(authority.length); i = dart.notNull(i) + 1) {
-          if (authority.codeUnitAt(i) === Uri[_AT_SIGN]) {
+          if (authority.codeUnitAt(i) == Uri[_AT_SIGN]) {
             hasUserInfo = true;
             userInfo = authority.substring(0, i);
             hostStart = dart.notNull(i) + 1;
             break;
           }
         }
         let hostEnd = hostStart;
-        if (dart.notNull(hostStart) < dart.notNull(authority.length) && authority.codeUnitAt(hostStart) === Uri[_LEFT_BRACKET]) {
+        if (dart.notNull(hostStart) < dart.notNull(authority.length) && authority.codeUnitAt(hostStart) == Uri[_LEFT_BRACKET]) {
           for (; dart.notNull(hostEnd) < dart.notNull(authority.length); hostEnd = dart.notNull(hostEnd) + 1) {
-            if (authority.codeUnitAt(hostEnd) === Uri[_RIGHT_BRACKET])
+            if (authority.codeUnitAt(hostEnd) == Uri[_RIGHT_BRACKET])
               break;
           }
-          if (hostEnd === authority.length) {
+          if (hostEnd == authority.length) {
             throw new FormatException("Invalid IPv6 host entry.", authority, hostStart);
           }
           Uri.parseIPv6Address(authority, dart.notNull(hostStart) + 1, hostEnd);
           hostEnd = dart.notNull(hostEnd) + 1;
-          if (hostEnd !== authority.length && authority.codeUnitAt(hostEnd) !== Uri[_COLON]) {
+          if (hostEnd != authority.length && authority.codeUnitAt(hostEnd) != Uri[_COLON]) {
             throw new FormatException("Invalid end of authority", authority, hostEnd);
           }
         }
         let hasPort = false;
         for (; dart.notNull(hostEnd) < dart.notNull(authority.length); hostEnd = dart.notNull(hostEnd) + 1) {
-          if (authority.codeUnitAt(hostEnd) === Uri[_COLON]) {
+          if (authority.codeUnitAt(hostEnd) == Uri[_COLON]) {
             let portString = authority.substring(dart.notNull(hostEnd) + 1);
             if (portString.isNotEmpty)
               port = int.parse(portString);
             break;
           }
         }
         host = authority.substring(hostStart, hostEnd);
       }
       return new Uri({scheme: scheme, userInfo: userInfo, host: dart.as(host, String), port: dart.as(port, int), pathSegments: unencodedPath.split("/"), queryParameters: queryParameters});
     }
     file(path, opts) {
       let windows = opts && 'windows' in opts ? opts.windows : null;
-      windows = windows === null ? Uri[_isWindows] : windows;
+      windows = windows == null ? Uri[_isWindows] : windows;
       return dart.as(windows ? Uri[_makeWindowsFileUrl](path) : Uri[_makeFileUri](path), Uri);
     }
     static get base() {
       let uri = _js_helper.Primitives.currentUri();
-      if (uri !== null)
+      if (uri != null)
         return Uri.parse(uri);
       throw new UnsupportedError("'Uri.base' is not supported");
     }
     static get [_isWindows]() {
       return false;
     }
     static [_checkNonWindowsPathReservedCharacters](segments, argumentError) {
       segments.forEach(dart.closureWrap((segment) => {
         if (dart.dinvoke(segment, 'contains', "/")) {
           if (argumentError) {
@@ skipping 34 matching lines @@
       } else {
         return new Uri({pathSegments: path.split(sep)});
       }
     }
     static [_makeWindowsFileUrl](path) {
       if (path.startsWith("\\\\?\\")) {
         if (path.startsWith("\\\\?\\UNC\\")) {
           path = `\\${path.substring(7)}`;
         } else {
           path = path.substring(4);
-          if (dart.notNull(path.length) < 3 || path.codeUnitAt(1) !== Uri[_COLON] || path.codeUnitAt(2) !== Uri[_BACKSLASH]) {
+          if (dart.notNull(path.length) < 3 || path.codeUnitAt(1) != Uri[_COLON] || path.codeUnitAt(2) != Uri[_BACKSLASH]) {
             throw new ArgumentError("Windows paths with \\\\?\\ prefix must be absolute");
           }
         }
       } else {
         path = path.replaceAll("/", "\\");
       }
       let sep = "\\";
-      if (dart.notNull(path.length) > 1 && dart.notNull(dart.equals(path.get(1), ":"))) {
+      if (dart.notNull(path.length) > 1 && dart.notNull(path.get(1) == ":")) {
         Uri[_checkWindowsDriveLetter](path.codeUnitAt(0), true);
-        if (path.length === 2 || path.codeUnitAt(2) !== Uri[_BACKSLASH]) {
+        if (path.length == 2 || path.codeUnitAt(2) != Uri[_BACKSLASH]) {
           throw new ArgumentError("Windows paths with drive letter must be absolute");
         }
         let pathSegments = path.split(sep);
         Uri[_checkWindowsPathReservedCharacters](pathSegments, true, 1);
         return new Uri({scheme: "file", pathSegments: pathSegments});
       }
-      if (dart.notNull(path.length) > 0 && dart.notNull(dart.equals(path.get(0), sep))) {
-        if (dart.notNull(path.length) > 1 && dart.notNull(dart.equals(path.get(1), sep))) {
+      if (dart.notNull(path.length) > 0 && dart.notNull(path.get(0) == sep)) {
+        if (dart.notNull(path.length) > 1 && dart.notNull(path.get(1) == sep)) {
           let pathStart = path.indexOf("\\", 2);
-          let hostPart = pathStart === -1 ? path.substring(2) : path.substring(2, pathStart);
-          let pathPart = pathStart === -1 ? "" : path.substring(dart.notNull(pathStart) + 1);
+          let hostPart = pathStart == -1 ? path.substring(2) : path.substring(2, pathStart);
+          let pathPart = pathStart == -1 ? "" : path.substring(dart.notNull(pathStart) + 1);
           let pathSegments = pathPart.split(sep);
           Uri[_checkWindowsPathReservedCharacters](pathSegments, true);
           return new Uri({scheme: "file", host: hostPart, pathSegments: pathSegments});
         } else {
           let pathSegments = path.split(sep);
           Uri[_checkWindowsPathReservedCharacters](pathSegments, true);
           return new Uri({scheme: "file", pathSegments: pathSegments});
         }
       } else {
         let pathSegments = path.split(sep);
         Uri[_checkWindowsPathReservedCharacters](pathSegments, true);
         return new Uri({pathSegments: pathSegments});
       }
     }
     replace(opts) {
       let scheme = opts && 'scheme' in opts ? opts.scheme : null;
       let userInfo = opts && 'userInfo' in opts ? opts.userInfo : null;
       let host = opts && 'host' in opts ? opts.host : null;
       let port = opts && 'port' in opts ? opts.port : null;
       let path = opts && 'path' in opts ? opts.path : null;
       let pathSegments = opts && 'pathSegments' in opts ? opts.pathSegments : null;
       let query = opts && 'query' in opts ? opts.query : null;
       let queryParameters = opts && 'queryParameters' in opts ? opts.queryParameters : null;
       let fragment = opts && 'fragment' in opts ? opts.fragment : null;
       let schemeChanged = false;
-      if (scheme !== null) {
+      if (scheme != null) {
         scheme = Uri[_makeScheme](scheme, scheme.length);
         schemeChanged = true;
       } else {
         scheme = this.scheme;
       }
-      let isFile = dart.equals(scheme, "file");
-      if (userInfo !== null) {
+      let isFile = scheme == "file";
+      if (userInfo != null) {
         userInfo = Uri[_makeUserInfo](userInfo, 0, userInfo.length);
       } else {
         userInfo = this.userInfo;
       }
-      if (port !== null) {
+      if (port != null) {
         port = Uri[_makePort](port, scheme);
       } else {
         port = this[_port];
         if (schemeChanged) {
           port = Uri[_makePort](port, scheme);
         }
       }
-      if (host !== null) {
+      if (host != null) {
         host = Uri[_makeHost](host, 0, host.length, false);
       } else if (this.hasAuthority) {
         host = this.host;
-      } else if (dart.notNull(userInfo.isNotEmpty) || port !== null || dart.notNull(isFile)) {
+      } else if (dart.notNull(userInfo.isNotEmpty) || port != null || dart.notNull(isFile)) {
         host = "";
       }
-      let ensureLeadingSlash = host !== null;
-      if (dart.notNull(path !== null) || dart.notNull(pathSegments !== null)) {
+      let ensureLeadingSlash = host != null;
+      if (dart.notNull(path != null) || dart.notNull(pathSegments != null)) {
         path = Uri[_makePath](path, 0, Uri[_stringOrNullLength](path), pathSegments, ensureLeadingSlash, isFile);
       } else {
         path = this.path;
         if ((dart.notNull(isFile) || dart.notNull(ensureLeadingSlash) && !dart.notNull(path.isEmpty)) && !dart.notNull(path.startsWith('/'))) {
           path = `/${path}`;
         }
       }
-      if (dart.notNull(query !== null) || dart.notNull(queryParameters !== null)) {
+      if (dart.notNull(query != null) || dart.notNull(queryParameters != null)) {
         query = Uri[_makeQuery](query, 0, Uri[_stringOrNullLength](query), queryParameters);
       } else if (this.hasQuery) {
         query = this.query;
       }
-      if (fragment !== null) {
+      if (fragment != null) {
         fragment = Uri[_makeFragment](fragment, 0, fragment.length);
       } else if (this.hasFragment) {
         fragment = this.fragment;
       }
       return new Uri[_internal$](scheme, userInfo, host, port, path, query, fragment);
     }
     get pathSegments() {
-      if (this[_pathSegments] === null) {
-        let pathToSplit = !dart.notNull(this.path.isEmpty) && this.path.codeUnitAt(0) === Uri[_SLASH] ? this.path.substring(1) : this.path;
-        this[_pathSegments] = dart.as(new collection.UnmodifiableListView(dart.equals(pathToSplit, "") ? /* Unimplemented const */new List$(String).from([]) : pathToSplit.split("/").map(Uri.decodeComponent).toList({growable: false})), List$(String));
+      if (this[_pathSegments] == null) {
+        let pathToSplit = !dart.notNull(this.path.isEmpty) && this.path.codeUnitAt(0) == Uri[_SLASH] ? this.path.substring(1) : this.path;
+        this[_pathSegments] = dart.as(new collection.UnmodifiableListView(pathToSplit == "" ? /* Unimplemented const */new List$(String).from([]) : pathToSplit.split("/").map(Uri.decodeComponent).toList({growable: false})), List$(String));
       }
       return this[_pathSegments];
     }
     get queryParameters() {
-      if (this[_queryParameters] === null) {
+      if (this[_queryParameters] == null) {
         this[_queryParameters] = dart.as(new collection.UnmodifiableMapView(Uri.splitQueryString(this.query)), Map$(String, String));
       }
       return this[_queryParameters];
     }
     static [_makePort](port, scheme) {
-      if (port !== null && port === Uri[_defaultPort](scheme))
+      if (port != null && port == Uri[_defaultPort](scheme))
         return null;
       return port;
     }
     static [_makeHost](host, start, end, strictIPv6) {
-      if (host === null)
+      if (host == null)
         return null;
-      if (start === end)
+      if (start == end)
         return "";
-      if (host.codeUnitAt(start) === Uri[_LEFT_BRACKET]) {
-        if (host.codeUnitAt(dart.notNull(end) - 1) !== Uri[_RIGHT_BRACKET]) {
+      if (host.codeUnitAt(start) == Uri[_LEFT_BRACKET]) {
+        if (host.codeUnitAt(dart.notNull(end) - 1) != Uri[_RIGHT_BRACKET]) {
           Uri[_fail](host, start, 'Missing end `]` to match `[` in host');
         }
         Uri.parseIPv6Address(host, dart.notNull(start) + 1, dart.notNull(end) - 1);
         return host.substring(start, end).toLowerCase();
       }
       if (!dart.notNull(strictIPv6)) {
         for (let i = start; dart.notNull(i) < dart.notNull(end); i = dart.notNull(i) + 1) {
-          if (host.codeUnitAt(i) === Uri[_COLON]) {
+          if (host.codeUnitAt(i) == Uri[_COLON]) {
             Uri.parseIPv6Address(host, start, end);
             return `[${host}]`;
           }
         }
       }
       return Uri[_normalizeRegName](host, start, end);
     }
     static [_isRegNameChar](char) {
       return dart.notNull(char) < 127 && dart.notNull(!dart.equals(dart.dbinary(Uri[_regNameTable].get(dart.notNull(char) >> 4), '&', 1 << (dart.notNull(char) & 15)), 0));
     }
     static [_normalizeRegName](host, start, end) {
       let buffer = null;
       let sectionStart = start;
       let index = start;
       let isNormalized = true;
       while (dart.notNull(index) < dart.notNull(end)) {
         let char = host.codeUnitAt(index);
-        if (char === Uri[_PERCENT]) {
+        if (char == Uri[_PERCENT]) {
           let replacement = Uri[_normalizeEscape](host, index, true);
-          if (dart.notNull(replacement === null) && dart.notNull(isNormalized)) {
+          if (dart.notNull(replacement == null) && dart.notNull(isNormalized)) {
             index = 3;
             continue;
           }
-          if (buffer === null)
+          if (buffer == null)
             buffer = new StringBuffer();
           let slice = host.substring(sectionStart, index);
           if (!dart.notNull(isNormalized))
             slice = slice.toLowerCase();
           buffer.write(slice);
           let sourceLength = 3;
-          if (replacement === null) {
+          if (replacement == null) {
             replacement = host.substring(index, dart.notNull(index) + 3);
-          } else if (dart.equals(replacement, "%")) {
+          } else if (replacement == "%") {
             replacement = "%25";
             sourceLength = 1;
           }
           buffer.write(replacement);
           index = sourceLength;
           sectionStart = index;
           isNormalized = true;
         } else if (Uri[_isRegNameChar](char)) {
           if (dart.notNull(isNormalized) && dart.notNull(Uri[_UPPER_CASE_A]) <= dart.notNull(char) && dart.notNull(Uri[_UPPER_CASE_Z]) >= dart.notNull(char)) {
-            if (buffer === null)
+            if (buffer == null)
               buffer = new StringBuffer();
             if (dart.notNull(sectionStart) < dart.notNull(index)) {
               buffer.write(host.substring(sectionStart, index));
               sectionStart = index;
             }
             isNormalized = false;
           }
           index = dart.notNull(index) + 1;
         } else if (Uri[_isGeneralDelimiter](char)) {
           Uri[_fail](host, index, "Invalid character");
         } else {
           let sourceLength = 1;
-          if ((dart.notNull(char) & 64512) === 55296 && dart.notNull(index) + 1 < dart.notNull(end)) {
+          if ((dart.notNull(char) & 64512) == 55296 && dart.notNull(index) + 1 < dart.notNull(end)) {
             let tail = host.codeUnitAt(dart.notNull(index) + 1);
-            if ((dart.notNull(tail) & 64512) === 56320) {
+            if ((dart.notNull(tail) & 64512) == 56320) {
               char = 65536 | (dart.notNull(char) & 1023) << 10 | dart.notNull(tail) & 1023;
               sourceLength = 2;
             }
           }
-          if (buffer === null)
+          if (buffer == null)
             buffer = new StringBuffer();
           let slice = host.substring(sectionStart, index);
           if (!dart.notNull(isNormalized))
             slice = slice.toLowerCase();
           buffer.write(slice);
           buffer.write(Uri[_escapeChar](char));
           index = sourceLength;
           sectionStart = index;
         }
       }
-      if (buffer === null)
+      if (buffer == null)
         return host.substring(start, end);
       if (dart.notNull(sectionStart) < dart.notNull(end)) {
         let slice = host.substring(sectionStart, end);
         if (!dart.notNull(isNormalized))
           slice = slice.toLowerCase();
         buffer.write(slice);
       }
       return buffer.toString();
     }
     static [_makeScheme](scheme, end) {
-      if (end === 0)
+      if (end == 0)
         return "";
       let firstCodeUnit = scheme.codeUnitAt(0);
       if (!dart.notNull(Uri[_isAlphabeticCharacter](firstCodeUnit))) {
         Uri[_fail](scheme, 0, "Scheme not starting with alphabetic character");
       }
       let allLowercase = dart.notNull(firstCodeUnit) >= dart.notNull(Uri[_LOWER_CASE_A]);
       for (let i = 0; dart.notNull(i) < dart.notNull(end); i = dart.notNull(i) + 1) {
         let codeUnit = scheme.codeUnitAt(i);
         if (!dart.notNull(Uri[_isSchemeCharacter](codeUnit))) {
           Uri[_fail](scheme, i, "Illegal scheme character");
         }
         if (dart.notNull(codeUnit) < dart.notNull(Uri[_LOWER_CASE_A]) || dart.notNull(codeUnit) > dart.notNull(Uri[_LOWER_CASE_Z])) {
           allLowercase = false;
         }
       }
       scheme = scheme.substring(0, end);
       if (!dart.notNull(allLowercase))
         scheme = scheme.toLowerCase();
       return scheme;
     }
     static [_makeUserInfo](userInfo, start, end) {
-      if (userInfo === null)
+      if (userInfo == null)
         return "";
       return Uri[_normalize](userInfo, start, end, dart.as(Uri[_userinfoTable], List$(int)));
     }
     static [_makePath](path, start, end, pathSegments, ensureLeadingSlash, isFile) {
-      if (dart.notNull(path === null) && dart.notNull(pathSegments === null))
+      if (dart.notNull(path == null) && dart.notNull(pathSegments == null))
         return isFile ? "/" : "";
-      if (dart.notNull(path !== null) && dart.notNull(pathSegments !== null)) {
+      if (dart.notNull(path != null) && dart.notNull(pathSegments != null)) {
         throw new ArgumentError('Both path and pathSegments specified');
       }
       let result = null;
-      if (path !== null) {
+      if (path != null) {
         result = Uri[_normalize](path, start, end, dart.as(Uri[_pathCharOrSlashTable], List$(int)));
       } else {
         result = pathSegments.map(dart.closureWrap((s) => Uri[_uriEncode](dart.as(Uri[_pathCharTable], List$(int)), dart.as(s, String)), "(String) → dynamic")).join("/");
       }
       if (dart.dload(result, 'isEmpty')) {
         if (isFile)
           return "/";
       } else if ((dart.notNull(isFile) || dart.notNull(ensureLeadingSlash)) && dart.notNull(!dart.equals(dart.dinvoke(result, 'codeUnitAt', 0), Uri[_SLASH]))) {
         return `/${result}`;
       }
       return dart.as(result, String);
     }
     static [_makeQuery](query, start, end, queryParameters) {
-      if (dart.notNull(query === null) && dart.notNull(queryParameters === null))
+      if (dart.notNull(query == null) && dart.notNull(queryParameters == null))
         return null;
-      if (dart.notNull(query !== null) && dart.notNull(queryParameters !== null)) {
+      if (dart.notNull(query != null) && dart.notNull(queryParameters != null)) {
         throw new ArgumentError('Both query and queryParameters specified');
       }
-      if (query !== null)
+      if (query != null)
         return Uri[_normalize](query, start, end, dart.as(Uri[_queryCharTable], List$(int)));
       let result = new StringBuffer();
       let first = true;
       queryParameters.forEach(dart.closureWrap(((key, value) => {
         if (!dart.notNull(first)) {
           result.write("&");
         }
         first = false;
         result.write(Uri.encodeQueryComponent(dart.as(key, String)));
-        if (dart.notNull(value !== null) && dart.notNull(dart.dunary('!', dart.dload(value, 'isEmpty')))) {
+        if (dart.notNull(value != null) && dart.notNull(dart.dunary('!', dart.dload(value, 'isEmpty')))) {
           result.write("=");
           result.write(Uri.encodeQueryComponent(dart.as(value, String)));
         }
       }).bind(this), "(String, String) → void"));
       return result.toString();
     }
     static [_makeFragment](fragment, start, end) {
-      if (fragment === null)
+      if (fragment == null)
         return null;
       return Uri[_normalize](fragment, start, end, dart.as(Uri[_queryCharTable], List$(int)));
     }
     static [_stringOrNullLength](s) {
-      return s === null ? 0 : s.length;
+      return s == null ? 0 : s.length;
     }
     static [_isHexDigit](char) {
       if (dart.notNull(Uri[_NINE]) >= dart.notNull(char))
         return dart.notNull(Uri[_ZERO]) <= dart.notNull(char);
       char = 32;
       return dart.notNull(Uri[_LOWER_CASE_A]) <= dart.notNull(char) && dart.notNull(Uri[_LOWER_CASE_F]) >= dart.notNull(char);
     }
     static [_hexValue](char) {
       dart.assert(Uri[_isHexDigit](char));
       if (dart.notNull(Uri[_NINE]) >= dart.notNull(char))
         return dart.notNull(char) - dart.notNull(Uri[_ZERO]);
       char = 32;
       return dart.notNull(char) - (dart.notNull(Uri[_LOWER_CASE_A]) - 10);
     }
     static [_normalizeEscape](source, index, lowerCase) {
-      dart.assert(source.codeUnitAt(index) === Uri[_PERCENT]);
+      dart.assert(source.codeUnitAt(index) == Uri[_PERCENT]);
       if (dart.notNull(index) + 2 >= dart.notNull(source.length)) {
         return "%";
       }
       let firstDigit = source.codeUnitAt(dart.notNull(index) + 1);
       let secondDigit = source.codeUnitAt(dart.notNull(index) + 2);
       if (!dart.notNull(Uri[_isHexDigit](firstDigit)) || !dart.notNull(Uri[_isHexDigit](secondDigit))) {
         return "%";
       }
       let value = dart.notNull(Uri[_hexValue](firstDigit)) * 16 + dart.notNull(Uri[_hexValue](secondDigit));
       if (Uri[_isUnreservedChar](value)) {
@@ skipping 42 matching lines @@
         }
       }
       return new String.fromCharCodes(dart.as(codeUnits, Iterable$(int)));
     }
     static [_normalize](component, start, end, charTable) {
       let buffer = null;
       let sectionStart = start;
       let index = start;
       while (dart.notNull(index) < dart.notNull(end)) {
         let char = component.codeUnitAt(index);
-        if (dart.notNull(char) < 127 && (dart.notNull(charTable.get(dart.notNull(char) >> 4)) & 1 << (dart.notNull(char) & 15)) !== 0) {
+        if (dart.notNull(char) < 127 && (dart.notNull(charTable.get(dart.notNull(char) >> 4)) & 1 << (dart.notNull(char) & 15)) != 0) {
           index = dart.notNull(index) + 1;
         } else {
           let replacement = null;
           let sourceLength = null;
-          if (char === Uri[_PERCENT]) {
+          if (char == Uri[_PERCENT]) {
             replacement = Uri[_normalizeEscape](component, index, false);
-            if (replacement === null) {
+            if (replacement == null) {
               index = 3;
               continue;
             }
-            if (dart.equals("%", replacement)) {
+            if ("%" == replacement) {
               replacement = "%25";
               sourceLength = 1;
             } else {
               sourceLength = 3;
             }
           } else if (Uri[_isGeneralDelimiter](char)) {
             Uri[_fail](component, index, "Invalid character");
           } else {
             sourceLength = 1;
-            if ((dart.notNull(char) & 64512) === 55296) {
+            if ((dart.notNull(char) & 64512) == 55296) {
               if (dart.notNull(index) + 1 < dart.notNull(end)) {
                 let tail = component.codeUnitAt(dart.notNull(index) + 1);
-                if ((dart.notNull(tail) & 64512) === 56320) {
+                if ((dart.notNull(tail) & 64512) == 56320) {
                   sourceLength = 2;
                   char = 65536 | (dart.notNull(char) & 1023) << 10 | dart.notNull(tail) & 1023;
                 }
               }
             }
             replacement = Uri[_escapeChar](char);
           }
-          if (buffer === null)
+          if (buffer == null)
             buffer = new StringBuffer();
           buffer.write(component.substring(sectionStart, index));
           buffer.write(replacement);
           index = sourceLength;
           sectionStart = index;
         }
       }
-      if (buffer === null) {
+      if (buffer == null) {
         return component.substring(start, end);
       }
       if (dart.notNull(sectionStart) < dart.notNull(end)) {
         buffer.write(component.substring(sectionStart, end));
       }
       return buffer.toString();
     }
     static [_isSchemeCharacter](ch) {
       return dart.notNull(ch) < 128 && dart.notNull(!dart.equals(dart.dbinary(Uri[_schemeTable].get(dart.notNull(ch) >> 4), '&', 1 << (dart.notNull(ch) & 15)), 0));
     }
     static [_isGeneralDelimiter](ch) {
       return dart.notNull(ch) <= dart.notNull(Uri[_RIGHT_BRACKET]) && dart.notNull(!dart.equals(dart.dbinary(Uri[_genDelimitersTable].get(dart.notNull(ch) >> 4), '&', 1 << (dart.notNull(ch) & 15)), 0));
     }
     get isAbsolute() {
-      return dart.notNull(!dart.equals(this.scheme, "")) && dart.notNull(dart.equals(this.fragment, ""));
+      return dart.notNull(this.scheme != "") && dart.notNull(this.fragment == "");
     }
     [_merge](base, reference) {
       if (base.isEmpty)
         return `/${reference}`;
       let backCount = 0;
       let refStart = 0;
       while (reference.startsWith("../", refStart)) {
         refStart = 3;
         backCount = dart.notNull(backCount) + 1;
       }
       let baseEnd = base.lastIndexOf('/');
       while (dart.notNull(baseEnd) > 0 && dart.notNull(backCount) > 0) {
         let newEnd = base.lastIndexOf('/', dart.notNull(baseEnd) - 1);
         if (dart.notNull(newEnd) < 0) {
           break;
         }
         let delta = dart.notNull(baseEnd) - dart.notNull(newEnd);
-        if ((delta === 2 || delta === 3) && base.codeUnitAt(dart.notNull(newEnd) + 1) === Uri[_DOT] && (delta === 2 || base.codeUnitAt(dart.notNull(newEnd) + 2) === Uri[_DOT])) {
+        if ((delta == 2 || delta == 3) && base.codeUnitAt(dart.notNull(newEnd) + 1) == Uri[_DOT] && (delta == 2 || base.codeUnitAt(dart.notNull(newEnd) + 2) == Uri[_DOT])) {
           break;
         }
         baseEnd = newEnd;
         backCount = dart.notNull(backCount) - 1;
       }
       return String['+'](base.substring(0, dart.notNull(baseEnd) + 1), reference.substring(dart.notNull(refStart) - 3 * dart.notNull(backCount)));
     }
     [_hasDotSegments](path) {
-      if (dart.notNull(path.length) > 0 && path.codeUnitAt(0) === Uri[_DOT])
+      if (dart.notNull(path.length) > 0 && path.codeUnitAt(0) == Uri[_DOT])
         return true;
       let index = path.indexOf("/.");
-      return index !== -1;
+      return index != -1;
     }
     [_removeDotSegments](path) {
       if (!dart.notNull(this[_hasDotSegments](path)))
         return path;
       let output = dart.as(new List.from([]), List$(String));
       let appendSlash = false;
       for (let segment of path.split("/")) {
         appendSlash = false;
-        if (dart.equals(segment, "..")) {
-          if (!dart.notNull(output.isEmpty) && (output.length !== 1 || dart.notNull(!dart.equals(output.get(0), ""))))
+        if (segment == "..") {
+          if (!dart.notNull(output.isEmpty) && (output.length != 1 || dart.notNull(output.get(0) != "")))
             output.removeLast();
           appendSlash = true;
-        } else if (dart.equals(".", segment)) {
+        } else if ("." == segment) {
           appendSlash = true;
         } else {
           output.add(segment);
         }
       }
       if (appendSlash)
         output.add("");
       return output.join("/");
     }
     resolve(reference) {
@@ skipping 20 matching lines @@
       } else {
         targetScheme = this.scheme;
         if (reference.hasAuthority) {
           targetUserInfo = reference.userInfo;
           targetHost = reference.host;
           targetPort = Uri[_makePort](reference.hasPort ? reference.port : null, targetScheme);
           targetPath = this[_removeDotSegments](reference.path);
           if (reference.hasQuery)
             targetQuery = reference.query;
         } else {
-          if (dart.equals(reference.path, "")) {
+          if (reference.path == "") {
             targetPath = this[_path];
             if (reference.hasQuery) {
               targetQuery = reference.query;
             } else {
               targetQuery = this[_query];
             }
           } else {
             if (reference.path.startsWith("/")) {
               targetPath = this[_removeDotSegments](reference.path);
             } else {
               targetPath = this[_removeDotSegments](this[_merge](this[_path], reference.path));
             }
             if (reference.hasQuery)
               targetQuery = reference.query;
           }
           targetUserInfo = this[_userInfo];
           targetHost = this[_host];
           targetPort = this[_port];
         }
       }
       let fragment = reference.hasFragment ? reference.fragment : null;
       return new Uri[_internal$](targetScheme, targetUserInfo, targetHost, targetPort, targetPath, targetQuery, fragment);
     }
     get hasAuthority() {
-      return this[_host] !== null;
+      return this[_host] != null;
     }
     get hasPort() {
-      return this[_port] !== null;
+      return this[_port] != null;
     }
     get hasQuery() {
-      return this[_query] !== null;
+      return this[_query] != null;
     }
     get hasFragment() {
-      return this[_fragment] !== null;
+      return this[_fragment] != null;
     }
     get origin() {
-      if (dart.notNull(dart.equals(this.scheme, "")) || dart.notNull(this[_host] === null) || dart.notNull(dart.equals(this[_host], ""))) {
+      if (dart.notNull(this.scheme == "") || dart.notNull(this[_host] == null) || dart.notNull(this[_host] == "")) {
         throw new StateError(`Cannot use origin without a scheme: ${this}`);
       }
-      if (dart.notNull(!dart.equals(this.scheme, "http")) && dart.notNull(!dart.equals(this.scheme, "https"))) {
+      if (dart.notNull(this.scheme != "http") && dart.notNull(this.scheme != "https")) {
         throw new StateError(`Origin is only applicable schemes http and https: ${this}`);
       }
-      if (this[_port] === null)
+      if (this[_port] == null)
         return `${this.scheme}://${this[_host]}`;
       return `${this.scheme}://${this[_host]}:${this[_port]}`;
     }
     toFilePath(opts) {
       let windows = opts && 'windows' in opts ? opts.windows : null;
-      if (dart.notNull(!dart.equals(this.scheme, "")) && dart.notNull(!dart.equals(this.scheme, "file"))) {
+      if (dart.notNull(this.scheme != "") && dart.notNull(this.scheme != "file")) {
         throw new UnsupportedError(`Cannot extract a file path from a ${this.scheme} URI`);
       }
-      if (!dart.equals(this.query, "")) {
+      if (this.query != "") {
         throw new UnsupportedError("Cannot extract a file path from a URI with a query component");
       }
-      if (!dart.equals(this.fragment, "")) {
+      if (this.fragment != "") {
         throw new UnsupportedError("Cannot extract a file path from a URI with a fragment component");
       }
-      if (windows === null)
+      if (windows == null)
         windows = Uri[_isWindows];
       return windows ? this[_toWindowsFilePath]() : this[_toFilePath]();
     }
     [_toFilePath]() {
-      if (!dart.equals(this.host, "")) {
+      if (this.host != "") {
         throw new UnsupportedError("Cannot extract a non-Windows file path from a file URI " + "with an authority");
       }
       Uri[_checkNonWindowsPathReservedCharacters](this.pathSegments, false);
       let result = new StringBuffer();
       if (this[_isPathAbsolute])
         result.write("/");
       result.writeAll(this.pathSegments, "/");
       return result.toString();
     }
     [_toWindowsFilePath]() {
       let hasDriveLetter = false;
       let segments = this.pathSegments;
-      if (dart.notNull(segments.length) > 0 && segments.get(0).length === 2 && segments.get(0).codeUnitAt(1) === Uri[_COLON]) {
+      if (dart.notNull(segments.length) > 0 && segments.get(0).length == 2 && segments.get(0).codeUnitAt(1) == Uri[_COLON]) {
         Uri[_checkWindowsDriveLetter](segments.get(0).codeUnitAt(0), false);
         Uri[_checkWindowsPathReservedCharacters](segments, false, 1);
         hasDriveLetter = true;
       } else {
         Uri[_checkWindowsPathReservedCharacters](segments, false);
       }
       let result = new StringBuffer();
       if (dart.notNull(this[_isPathAbsolute]) && !dart.notNull(hasDriveLetter))
         result.write("\\");
-      if (!dart.equals(this.host, "")) {
+      if (this.host != "") {
         result.write("\\");
         result.write(this.host);
         result.write("\\");
       }
       result.writeAll(segments, "\\");
-      if (dart.notNull(hasDriveLetter) && segments.length === 1)
+      if (dart.notNull(hasDriveLetter) && segments.length == 1)
         result.write("\\");
       return result.toString();
     }
     get [_isPathAbsolute]() {
-      if (dart.notNull(this.path === null) || dart.notNull(this.path.isEmpty))
+      if (dart.notNull(this.path == null) || dart.notNull(this.path.isEmpty))
         return false;
       return this.path.startsWith('/');
     }
     [_writeAuthority](ss) {
       if (this[_userInfo].isNotEmpty) {
         ss.write(this[_userInfo]);
         ss.write("@");
       }
-      if (this[_host] !== null)
+      if (this[_host] != null)
         ss.write(this[_host]);
-      if (this[_port] !== null) {
+      if (this[_port] != null) {
         ss.write(":");
         ss.write(this[_port]);
       }
     }
     toString() {
       let sb = new StringBuffer();
       Uri[_addIfNonEmpty](sb, this.scheme, this.scheme, ':');
-      if (dart.notNull(this.hasAuthority) || dart.notNull(this.path.startsWith("//")) || dart.notNull(dart.equals(this.scheme, "file"))) {
+      if (dart.notNull(this.hasAuthority) || dart.notNull(this.path.startsWith("//")) || dart.notNull(this.scheme == "file")) {
         sb.write("//");
         this[_writeAuthority](sb);
       }
       sb.write(this.path);
-      if (this[_query] !== null) {
+      if (this[_query] != null) {
         sb.write("?");
         sb.write(this[_query]);
       }
-      if (this[_fragment] !== null) {
+      if (this[_fragment] != null) {
         sb.write("#");
         sb.write(this[_fragment]);
       }
       return sb.toString();
     }
     ['=='](other) {
       if (!dart.is(other, Uri))
         return false;
       let uri = dart.as(other, Uri);
-      return dart.notNull(dart.equals(this.scheme, uri.scheme)) && this.hasAuthority === uri.hasAuthority && dart.notNull(dart.equals(this.userInfo, uri.userInfo)) && dart.notNull(dart.equals(this.host, uri.host)) && this.port === uri.port && dart.notNull(dart.equals(this.path, uri.path)) && this.hasQuery === uri.hasQuery && dart.notNull(dart.equals(this.query, uri.query)) && this.hasFragment === uri.hasFragment && dart.notNull(dart.equals(this.fragment, uri.fragment));
+      return dart.notNull(this.scheme == uri.scheme) && this.hasAuthority == uri.hasAuthority && dart.notNull(this.userInfo == uri.userInfo) && dart.notNull(this.host == uri.host) && this.port == uri.port && dart.notNull(this.path == uri.path) && this.hasQuery == uri.hasQuery && dart.notNull(this.query == uri.query) && this.hasFragment == uri.hasFragment && dart.notNull(this.fragment == uri.fragment);
     }
     get hashCode() {
       // Function combine: (dynamic, dynamic) → int
       function combine(part, current) {
         return dart.as(dart.dbinary(dart.dbinary(dart.dbinary(current, '*', 31), '+', dart.dload(part, 'hashCode')), '&', 1073741823), int);
       }
       return combine(this.scheme, combine(this.userInfo, combine(this.host, combine(this.port, combine(this.path, combine(this.query, combine(this.fragment, 1)))))));
     }
     static [_addIfNonEmpty](sb, test, first, second) {
-      if (!dart.equals("", test)) {
+      if ("" != test) {
         sb.write(first);
         sb.write(second);
       }
     }
     static encodeComponent(component) {
       return Uri[_uriEncode](dart.as(Uri[_unreserved2396Table], List$(int)), component);
     }
     static encodeQueryComponent(component, opts) {
       let encoding = opts && 'encoding' in opts ? opts.encoding : convert.UTF8;
       return Uri[_uriEncode](dart.as(Uri[_unreservedTable], List$(int)), component, {encoding: encoding, spaceToPlus: true});
     }
     static decodeComponent(encodedComponent) {
       return Uri[_uriDecode](encodedComponent);
     }
     static decodeQueryComponent(encodedComponent, opts) {
       let encoding = opts && 'encoding' in opts ? opts.encoding : convert.UTF8;
       return Uri[_uriDecode](encodedComponent, {plusToSpace: true, encoding: encoding});
     }
     static encodeFull(uri) {
       return Uri[_uriEncode](dart.as(Uri[_encodeFullTable], List$(int)), uri);
     }
     static decodeFull(uri) {
       return Uri[_uriDecode](uri);
     }
     static splitQueryString(query, opts) {
       let encoding = opts && 'encoding' in opts ? opts.encoding : convert.UTF8;
       return dart.as(query.split("&").fold(dart.map(), dart.closureWrap((map, element) => {
         let index = dart.as(dart.dinvoke(element, 'indexOf', "="), int);
-        if (index === -1) {
+        if (index == -1) {
           if (!dart.equals(element, "")) {
             dart.dsetindex(map, Uri.decodeQueryComponent(dart.as(element, String), {encoding: encoding}), "");
           }
-        } else if (index !== 0) {
+        } else if (index != 0) {
           let key = dart.dinvoke(element, 'substring', 0, index);
           let value = dart.dinvoke(element, 'substring', dart.notNull(index) + 1);
           dart.dsetindex(map, Uri.decodeQueryComponent(dart.as(key, String), {encoding: encoding}), Uri.decodeQueryComponent(dart.as(value, String), {encoding: encoding}));
         }
         return map;
       }, "(dynamic, String) → dynamic")), Map$(String, String));
     }
     static parseIPv4Address(host) {
       // Function error: (String) → void
       function error(msg) {
         throw new FormatException(`Illegal IPv4 address, ${msg}`);
       }
       let bytes = host.split('.');
-      if (bytes.length !== 4) {
+      if (bytes.length != 4) {
         error('IPv4 address should contain exactly 4 parts');
       }
       return dart.as(bytes.map(dart.closureWrap((byteString) => {
         let byte = int.parse(dart.as(byteString, String));
         if (dart.notNull(byte) < 0 || dart.notNull(byte) > 255) {
           error('each part must be in the range of `0..255`');
         }
         return byte;
       }, "(String) → dynamic")).toList(), List$(int));
     }
     static parseIPv6Address(host, start, end) {
       if (start === void 0)
         start = 0;
       if (end === void 0)
         end = null;
-      if (end === null)
+      if (end == null)
         end = host.length;
       // Function error: (String, [dynamic]) → void
       function error(msg, position) {
         if (position === void 0)
           position = null;
         throw new FormatException(`Illegal IPv6 address, ${msg}`, host, dart.as(position, int));
       }
       // Function parseHex: (int, int) → int
       function parseHex(start, end) {
         if (dart.notNull(end) - dart.notNull(start) > 4) {
           error('an IPv6 part can only contain a maximum of 4 hex digits', start);
         }
         let value = int.parse(host.substring(start, end), {radix: 16});
         if (dart.notNull(value) < 0 || dart.notNull(value) > (1 << 16) - 1) {
           error('each part must be in the range of `0x0..0xFFFF`', start);
         }
         return value;
       }
       if (dart.notNull(host.length) < 2)
         error('address is too short');
       let parts = dart.as(new List.from([]), List$(int));
       let wildcardSeen = false;
       let partStart = start;
       for (let i = start; dart.notNull(i) < dart.notNull(end); i = dart.notNull(i) + 1) {
-        if (host.codeUnitAt(i) === Uri[_COLON]) {
-          if (i === start) {
+        if (host.codeUnitAt(i) == Uri[_COLON]) {
+          if (i == start) {
             i = dart.notNull(i) + 1;
-            if (host.codeUnitAt(i) !== Uri[_COLON]) {
+            if (host.codeUnitAt(i) != Uri[_COLON]) {
               error('invalid start colon.', i);
             }
             partStart = i;
           }
-          if (i === partStart) {
+          if (i == partStart) {
             if (wildcardSeen) {
               error('only one wildcard `::` is allowed', i);
             }
             wildcardSeen = true;
             parts.add(-1);
           } else {
             parts.add(parseHex(partStart, i));
           }
           partStart = dart.notNull(i) + 1;
         }
       }
-      if (parts.length === 0)
+      if (parts.length == 0)
         error('too few parts');
-      let atEnd = partStart === end;
-      let isLastWildcard = parts.last === -1;
+      let atEnd = partStart == end;
+      let isLastWildcard = parts.last == -1;
       if (dart.notNull(atEnd) && !dart.notNull(isLastWildcard)) {
         error('expected a part after last `:`', end);
       }
       if (!dart.notNull(atEnd)) {
         try {
           parts.add(parseHex(partStart, end));
         } catch (e) {
           try {
             let last = Uri.parseIPv4Address(host.substring(partStart, end));
             parts.add(dart.notNull(last.get(0)) << 8 | dart.notNull(last.get(1)));
             parts.add(dart.notNull(last.get(2)) << 8 | dart.notNull(last.get(3)));
           } catch (e) {
             error('invalid end of IPv6 address.', partStart);
           }
 
         }
 
       }
       if (wildcardSeen) {
         if (dart.notNull(parts.length) > 7) {
           error('an address with a wildcard must have less than 7 parts');
         }
-      } else if (parts.length !== 8) {
+      } else if (parts.length != 8) {
         error('an address without a wildcard must contain exactly 8 parts');
       }
       let bytes = new List(16);
       for (let i = 0, index = 0; dart.notNull(i) < dart.notNull(parts.length); i = dart.notNull(i) + 1) {
         let value = parts.get(i);
-        if (value === -1) {
+        if (value == -1) {
           let wildCardLength = 9 - dart.notNull(parts.length);
           for (let j = 0; dart.notNull(j) < dart.notNull(wildCardLength); j = dart.notNull(j) + 1) {
             bytes.set(index, 0);
             bytes.set(dart.notNull(index) + 1, 0);
             index = 2;
           }
         } else {
           bytes.set(index, dart.notNull(value) >> 8);
           bytes.set(dart.notNull(index) + 1, dart.notNull(value) & 255);
           index = 2;
         }
       }
       return dart.as(bytes, List$(int));
     }
     static [_uriEncode](canonicalTable, text, opts) {
       let encoding = opts && 'encoding' in opts ? opts.encoding : convert.UTF8;
       let spaceToPlus = opts && 'spaceToPlus' in opts ? opts.spaceToPlus : false;
       // Function byteToHex: (dynamic, dynamic) → dynamic
       function byteToHex(byte, buffer) {
         let hex = '0123456789ABCDEF';
         dart.dinvoke(buffer, 'writeCharCode', hex.codeUnitAt(dart.as(dart.dbinary(byte, '>>', 4), int)));
         dart.dinvoke(buffer, 'writeCharCode', hex.codeUnitAt(dart.as(dart.dbinary(byte, '&', 15), int)));
       }
       let result = new StringBuffer();
       let bytes = encoding.encode(text);
       for (let i = 0; dart.notNull(i) < dart.notNull(bytes.length); i = dart.notNull(i) + 1) {
         let byte = bytes.get(i);
-        if (dart.notNull(byte) < 128 && (dart.notNull(canonicalTable.get(dart.notNull(byte) >> 4)) & 1 << (dart.notNull(byte) & 15)) !== 0) {
+        if (dart.notNull(byte) < 128 && (dart.notNull(canonicalTable.get(dart.notNull(byte) >> 4)) & 1 << (dart.notNull(byte) & 15)) != 0) {
           result.writeCharCode(byte);
-        } else if (dart.notNull(spaceToPlus) && byte === Uri[_SPACE]) {
+        } else if (dart.notNull(spaceToPlus) && byte == Uri[_SPACE]) {
           result.writeCharCode(Uri[_PLUS]);
         } else {
           result.writeCharCode(Uri[_PERCENT]);
           byteToHex(byte, result);
         }
       }
       return result.toString();
     }
     static [_hexCharPairToByte](s, pos) {
       let byte = 0;
@@ skipping 11 matching lines @@
         }
       }
       return byte;
     }
     static [_uriDecode](text, opts) {
       let plusToSpace = opts && 'plusToSpace' in opts ? opts.plusToSpace : false;
       let encoding = opts && 'encoding' in opts ? opts.encoding : convert.UTF8;
       let simple = true;
       for (let i = 0; dart.notNull(i) < dart.notNull(text.length) && dart.notNull(simple); i = dart.notNull(i) + 1) {
         let codeUnit = text.codeUnitAt(i);
-        simple = codeUnit !== Uri[_PERCENT] && codeUnit !== Uri[_PLUS];
+        simple = codeUnit != Uri[_PERCENT] && codeUnit != Uri[_PLUS];
       }
       let bytes = null;
       if (simple) {
         if (dart.notNull(dart.equals(encoding, convert.UTF8)) || dart.notNull(dart.equals(encoding, convert.LATIN1))) {
           return text;
         } else {
           bytes = text.codeUnits;
         }
       } else {
         bytes = dart.as(new List(), List$(int));
         for (let i = 0; dart.notNull(i) < dart.notNull(text.length); i = dart.notNull(i) + 1) {
           let codeUnit = text.codeUnitAt(i);
           if (dart.notNull(codeUnit) > 127) {
             throw new ArgumentError("Illegal percent encoding in URI");
           }
-          if (codeUnit === Uri[_PERCENT]) {
+          if (codeUnit == Uri[_PERCENT]) {
             if (dart.notNull(i) + 3 > dart.notNull(text.length)) {
               throw new ArgumentError('Truncated URI');
             }
             bytes.add(Uri[_hexCharPairToByte](text, dart.notNull(i) + 1));
             i = 2;
-          } else if (dart.notNull(plusToSpace) && codeUnit === Uri[_PLUS]) {
+          } else if (dart.notNull(plusToSpace) && codeUnit == Uri[_PLUS]) {
             bytes.add(Uri[_SPACE]);
           } else {
             bytes.add(codeUnit);
           }
         }
       }
       return encoding.decode(bytes);
     }
     static [_isAlphabeticCharacter](codeUnit) {
       return dart.notNull(codeUnit) >= dart.notNull(Uri[_LOWER_CASE_A]) && dart.notNull(codeUnit) <= dart.notNull(Uri[_LOWER_CASE_Z]) || dart.notNull(codeUnit) >= dart.notNull(Uri[_UPPER_CASE_A]) && dart.notNull(codeUnit) <= dart.notNull(Uri[_UPPER_CASE_Z]);
@@ skipping 39 matching lines @@
   Uri._regNameTable = /* Unimplemented const */new List.from([0, 0, 32754, 11263, 65534, 34815, 65534, 18431]);
   Uri._pathCharTable = /* Unimplemented const */new List.from([0, 0, 32722, 12287, 65535, 34815, 65534, 18431]);
   Uri._pathCharOrSlashTable = /* Unimplemented const */new List.from([0, 0, 65490, 12287, 65535, 34815, 65534, 18431]);
   Uri._queryCharTable = /* Unimplemented const */new List.from([0, 0, 65490, 45055, 65535, 34815, 65534, 18431]);
   // Function _symbolToString: (Symbol) → String
   function _symbolToString(symbol) {
     return _internal.Symbol.getName(dart.as(symbol, _internal.Symbol));
   }
   // Function _symbolMapToStringMap: (Map<Symbol, dynamic>) → dynamic
   function _symbolMapToStringMap(map) {
-    if (map === null)
+    if (map == null)
       return null;
     let result = new Map();
     map.forEach((key, value) => {
       result.set(_symbolToString(key), value);
     });
     return result;
   }
   class _ListConstructorSentinel extends Object {
     _ListConstructorSentinel() {
     }
@@ skipping 59 matching lines @@
   exports.StackTrace = StackTrace;
   exports.Stopwatch = Stopwatch;
   exports.String = String;
   exports.RuneIterator = RuneIterator;
   exports.StringBuffer = StringBuffer;
   exports.StringSink = StringSink;
   exports.Symbol = Symbol;
   exports.Type = Type;
   exports.Uri = Uri;
 })(core || (core = {}));