Type check binary expressions

lib/runtime/dart/_interceptors.js

 var _interceptors = dart.defineLibrary(_interceptors, {});
 var core = dart.import(core);
 var _js_helper = dart.lazyImport(_js_helper);
 var _internal = dart.import(_internal);
 var _foreign_helper = dart.import(_foreign_helper);
 var _js_embedded_names = dart.import(_js_embedded_names);
 (function(exports, core, _js_helper, _internal, _foreign_helper, _js_embedded_names) {
   'use strict';
   let JSArray = Array;
   let JSMutableArray$ = dart.generic(function(E) {
@@ skipping 428 matching lines @@
     get bitLength() {
       let nonneg = this['<'](0) ? dart.notNull(this['unary-']()) - 1 : this;
       if (dart.notNull(nonneg) >= 4294967296) {
         nonneg = (dart.notNull(nonneg) / 4294967296).truncate();
         return dart.notNull(JSInt._bitCount(JSInt._spread(nonneg))) + 32;
       }
       return JSInt._bitCount(JSInt._spread(nonneg));
     }
     static _bitCount(i) {
       i = dart.as(dart.dsend(JSInt._shru(i, 0), '-', dart.dsend(JSInt._shru(i, 1), '&', 1431655765)), core.int);
-      i = (dart.notNull(i) & 858993459)['+'](dart.dsend(JSInt._shru(i, 2), '&', 858993459));
-      i = 252645135 & i['+'](JSInt._shru(i, 4));
+      i = (dart.notNull(i) & 858993459)['+'](dart.as(dart.dsend(JSInt._shru(i, 2), '&', 858993459), core.num));
+      i = 252645135 & dart.notNull(dart.notNull(i) + dart.notNull(dart.as(JSInt._shru(i, 4), core.num)));

[Leaf, 2015/05/20 16:13:22]

Ugly.  Do we really not know the type of _shru?  

[vsm, 2015/05/20 16:39:10]

It's declared dynamic for some reason.  Addressing in another CL.

       i = dart.notNull(i) + dart.notNull(dart.as(JSInt._shru(i, 8), core.int));
       i = dart.notNull(i) + dart.notNull(dart.as(JSInt._shru(i, 16), core.int));
       return dart.notNull(i) & 63;
     }
     static _shru(value, shift) {
       return value >>> shift;
     }
     static _shrs(value, shift) {
       return value >> shift;
     }
@@ skipping 759 matching lines @@
   exports.findInterceptorForType = findInterceptorForType;
   exports.JSBool = JSBool;
   exports.JSNull = JSNull;
   exports.JSIndexable = JSIndexable;
   exports.JSMutableIndexable = JSMutableIndexable;
   exports.JSObject = JSObject;
   exports.JavaScriptObject = JavaScriptObject;
   exports.PlainJavaScriptObject = PlainJavaScriptObject;
   exports.UnknownJavaScriptObject = UnknownJavaScriptObject;
 })(_interceptors, core, _js_helper, _internal, _foreign_helper, _js_embedded_names);