Fixes improper boxing in obj.dynamic

frog/minfrog

 #!/usr/bin/env node
 //  ********** Library dart:core **************
 //  ********** Natives dart:core **************
 function $throw(e) {
   // If e is not a value, we can use V8's captureStackTrace utility method.
   // TODO(jmesserly): capture the stack trace on other JS engines.
   if (e && (typeof e == 'object') && Error.captureStackTrace) {
     // TODO(jmesserly): this will clobber the e.stack property
     Error.captureStackTrace(e, $throw);
   }
@@ skipping 53 matching lines @@
   if (typeof(x) == 'number' && typeof(y) == 'number') {
     if (y == 0) $throw(new IntegerDivisionByZeroException());
     var tmp = x / y;
     return (tmp < 0) ? Math.ceil(tmp) : Math.floor(tmp);
   } else {
     return x.$truncdiv(y);
   }
 }
 // ********** Code for Object **************
 Object.prototype.get$dynamic = function() {
-  return this;
+  "use strict"; return this;
 }
 Object.prototype.noSuchMethod = function(name, args) {
   $throw(new NoSuchMethodException(this, name, args));
 }
 Object.prototype._checkExtends$0 = function() {
   return this.noSuchMethod("_checkExtends", []);
 };
 Object.prototype._checkNonStatic$1 = function($0) {
   return this.noSuchMethod("_checkNonStatic", [$0]);
 };
@@ skipping 13704 matching lines @@
   $globals._RED_COLOR = '\u001b[31m';
 }
 var const$1 = new EmptyQueueException()/*const EmptyQueueException()*/;
 var const$126 = new IllegalAccessException()/*const IllegalAccessException()*/;
 var const$127 = ImmutableList.ImmutableList$from$factory([])/*const []*/;
 var const$2 = new _DeletedKeySentinel()/*const _DeletedKeySentinel()*/;
 var const$7 = new NoMoreElementsException()/*const NoMoreElementsException()*/;
 var $globals = {};
 $static_init();
 main();