Roll analyzer to 0.27.2-alpha.1

lib/runtime/dart/convert.js

 dart_library.library('dart/convert', null, /* Imports */[
   'dart/_runtime',
   'dart/core',
   'dart/async',
   'dart/typed_data',
   'dart/_internal',
   'dart/collection'
 ], /* Lazy imports */[
 ], function(exports, dart, core, async, typed_data, _internal, collection) {
   'use strict';
@@ skipping 1155 matching lines @@
           dart.throw(new JsonUnsupportedObjectError(object));
         }
         this[_removeSeen](object);
       } catch (e) {
         dart.throw(new JsonUnsupportedObjectError(object, {cause: e}));
       }
 
     }
     writeJsonValue(object) {
       if (typeof object == 'number') {
-        if (!dart.notNull(dart.as(dart.dload(object, 'isFinite'), core.bool))) return false;
-        this.writeNumber(dart.as(object, core.num));
+        if (!dart.notNull(object[dartx.isFinite])) return false;
+        this.writeNumber(object);
         return true;
       } else if (dart.notNull(core.identical(object, true))) {
         this.writeString('true');
         return true;
       } else if (dart.notNull(core.identical(object, false))) {
         this.writeString('false');
         return true;
       } else if (object == null) {
         this.writeString('null');
         return true;
       } else if (typeof object == 'string') {
         this.writeString('"');
-        this.writeStringContent(dart.as(object, core.String));
+        this.writeStringContent(object);
         this.writeString('"');
         return true;
       } else if (dart.is(object, core.List)) {
         this[_checkCycle](object);
-        this.writeList(dart.as(object, core.List));
+        this.writeList(object);
         this[_removeSeen](object);
         return true;
       } else if (dart.is(object, core.Map)) {
         this[_checkCycle](object);
         this.writeMap(dart.as(object, core.Map$(core.String, core.Object)));
         this[_removeSeen](object);
         return true;
       } else {
         return false;
       }
@@ skipping 1606 matching lines @@
   exports.LineSplitter = LineSplitter;
   exports.StringConversionSink = StringConversionSink;
   exports.ClosableStringSink = ClosableStringSink;
   exports.UNICODE_REPLACEMENT_CHARACTER_RUNE = UNICODE_REPLACEMENT_CHARACTER_RUNE;
   exports.UNICODE_BOM_CHARACTER_RUNE = UNICODE_BOM_CHARACTER_RUNE;
   exports.Utf8Codec = Utf8Codec;
   exports.UTF8 = UTF8;
   exports.Utf8Encoder = Utf8Encoder;
   exports.Utf8Decoder = Utf8Decoder;
 });