Fixes for Angular

lib/runtime/dart/js.js

 dart_library.library('dart/js', null, /* Imports */[
   "dart_runtime/dart",
   'dart/core',
   'dart/collection',
   'dart/_js_helper'
 ], /* Lazy imports */[
 ], function(exports, dart, core, collection, _js_helper) {
   'use strict';
   let dartx = dart.dartx;
   dart.defineLazyProperties(exports, {
@@ skipping 338 matching lines @@
     dart.dsetindex(exports._dartProxies, wrapper, f);
     return wrapper;
   }
   dart.fn(_wrapDartFunction);
   function _convertToDart(o) {
     if (o == null || typeof o == "string" || typeof o == "number" || typeof o == "boolean" || dart.notNull(_isBrowserType(o))) {
       return o;
     } else if (o instanceof Date) {
       let ms = o.getTime();
       return new core.DateTime.fromMillisecondsSinceEpoch(ms);
-    } else if (dart.is(o, _DartObject)) {
+    } else if (dart.is(o, _DartObject) && dart.jsobject != dart.realRuntimeType(o)) {
       return dart.dload(o, _dartObj);
     } else {
       return _putIfAbsent(exports._dartProxies, o, _wrapToDart);
     }
   }
   dart.fn(_convertToDart, core.Object, [dart.dynamic]);
   function _wrapToDart(o) {
     if (typeof o == "function") {
       return new JsFunction._fromJs(o);
     }
@@ skipping 24 matching lines @@
     let __CastType0 = dart.typedef('__CastType0', () => dart.functionType(dart.dynamic, [E]));
     return __CastType0;
   });
   let __CastType0 = __CastType0$();
   // Exports:
   exports.JsObject = JsObject;
   exports.JsFunction = JsFunction;
   exports.JsArray$ = JsArray$;
   exports.JsArray = JsArray;
 });