Handle dynamic as bottom inside of function type reps

lib/runtime/dart/_interceptors.js

Index: lib/runtime/dart/_interceptors.js
diff --git a/lib/runtime/dart/_interceptors.js b/lib/runtime/dart/_interceptors.js
index 3b54a999999017794e7b65df893617ecaf50952f..e7d87a184e7bd4b6d16ff03f50f021bb9603f571 100644
--- a/lib/runtime/dart/_interceptors.js
+++ b/lib/runtime/dart/_interceptors.js
@@ -174,7 +174,7 @@ dart_library.library('dart/_interceptors', null, /* Imports */[
         }
       }
       [dartx.map](f) {
-        dart.as(f, dart.functionType(core.Object, [E]));
+        dart.as(f, dart.functionType(dart.dynamic, [E]));
         return _internal.IterableMixinWorkaround.mapList(this, f);
       }
       [dartx.join](separator) {
@@ -205,7 +205,7 @@ dart_library.library('dart/_interceptors', null, /* Imports */[
         return dart.as(_internal.IterableMixinWorkaround.reduce(this, combine), E);
       }
       [dartx.fold](initialValue, combine) {
-        dart.as(combine, dart.functionType(core.Object, [dart.bottom, E]));
+        dart.as(combine, dart.functionType(dart.dynamic, [dart.dynamic, E]));

[vsm, 2015/06/17 22:43:13]

Is the "dynamic" first arg param Top or Bottom in this context?  Would we need a
dinvoke to call combine at this point?

[Leaf, 2015/06/17 22:53:07]

Dynamic here will be treated as bottom, since function types are by default
fuzzy.  It's only things created via definiteFunctionType which retain dynamic
on the arguments.  For correctness this would need to be called with a dinvoke
here.

         return _internal.IterableMixinWorkaround.fold(this, initialValue, combine);
       }
       [dartx.firstWhere](test, opts) {
@@ -396,12 +396,12 @@ dart_library.library('dart/_interceptors', null, /* Imports */[
     dart.setSignature(JSArray, {
       constructors: () => ({
         JSArray: [JSArray$(E), []],
-        typed: [JSArray$(E), [core.Object]],
-        markFixed: [JSArray$(E), [core.Object]],
-        markGrowable: [JSArray$(E), [core.Object]]
+        typed: [JSArray$(E), [dart.dynamic]],
+        markFixed: [JSArray$(E), [dart.dynamic]],
+        markGrowable: [JSArray$(E), [dart.dynamic]]
       }),
       methods: () => ({
-        [dartx.checkGrowable]: [core.Object, [core.Object]],
+        [dartx.checkGrowable]: [dart.dynamic, [dart.dynamic]],
         [dartx.add]: [dart.void, [E]],
         [dartx.removeAt]: [E, [core.int]],
         [dartx.insert]: [dart.void, [core.int, E]],
@@ -416,14 +416,14 @@ dart_library.library('dart/_interceptors', null, /* Imports */[
         [dartx.addAll]: [dart.void, [core.Iterable$(E)]],
         [dartx.clear]: [dart.void, []],
         [dartx.forEach]: [dart.void, [dart.functionType(dart.void, [E])]],
-        [dartx.map]: [core.Iterable, [dart.functionType(core.Object, [E])]],
+        [dartx.map]: [core.Iterable, [dart.functionType(dart.dynamic, [E])]],
         [dartx.join]: [core.String, [], [core.String]],
         [dartx.take]: [core.Iterable$(E), [core.int]],
         [dartx.takeWhile]: [core.Iterable$(E), [dart.functionType(core.bool, [E])]],
         [dartx.skip]: [core.Iterable$(E), [core.int]],
         [dartx.skipWhile]: [core.Iterable$(E), [dart.functionType(core.bool, [E])]],
         [dartx.reduce]: [E, [dart.functionType(E, [E, E])]],
-        [dartx.fold]: [core.Object, [core.Object, dart.functionType(core.Object, [dart.bottom, E])]],
+        [dartx.fold]: [dart.dynamic, [dart.dynamic, dart.functionType(dart.dynamic, [dart.dynamic, E])]],
         [dartx.firstWhere]: [E, [dart.functionType(core.bool, [E])], {orElse: dart.functionType(E, [])}],
         [dartx.lastWhere]: [E, [dart.functionType(core.bool, [E])], {orElse: dart.functionType(E, [])}],
         [dartx.singleWhere]: [E, [dart.functionType(core.bool, [E])]],
@@ -866,7 +866,7 @@ dart_library.library('dart/_interceptors', null, /* Imports */[
       [dartx['/']]: [core.double, [core.num]],
       [dartx['*']]: [core.num, [core.num]],
       [dartx['%']]: [core.num, [core.num]],
-      [_isInt32]: [core.bool, [core.Object]],
+      [_isInt32]: [core.bool, [dart.dynamic]],
       [dartx['~/']]: [core.int, [core.num]],
       [_tdivFast]: [core.int, [core.num]],
       [_tdivSlow]: [core.int, [core.num]],