SDK fixes

test/generated_sdk/lib/_internal/compiler/js_lib/js_number.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of _interceptors;
 
 /**
  * The super interceptor class for [JSInt] and [JSDouble]. The compiler
  * recognizes this class as an interceptor, and changes references to
  * [:this:] to actually use the receiver of the method, which is
@@ skipping 76 matching lines @@
   double roundToDouble() {
     if (this < 0) {
       return JS('num', r'-Math.round(-#)', this);
     } else {
       return JS('num', r'Math.round(#)', this);
     }
   }
 
   double truncateToDouble() => this < 0 ? ceilToDouble() : floorToDouble();
 
-  num clamp(lowerLimit, upperLimit) {
+  num clamp(num lowerLimit, num upperLimit) {
     if (lowerLimit is! num) throw new ArgumentError(lowerLimit);
     if (upperLimit is! num) throw new ArgumentError(upperLimit);
     if (lowerLimit.compareTo(upperLimit) > 0) {
       throw new ArgumentError(lowerLimit);
     }
     if (this.compareTo(lowerLimit) < 0) return lowerLimit;
     if (this.compareTo(upperLimit) > 0) return upperLimit;
     return this;
   }
 
@@ skipping 83 matching lines @@
   num operator +(num other) {
     if (other is !num) throw new ArgumentError(other);
     return JS('num', '# + #', this, other);
   }
 
   num operator -(num other) {
     if (other is !num) throw new ArgumentError(other);
     return JS('num', '# - #', this, other);
   }
 
-  num operator /(num other) {
+  double operator /(num other) {
     if (other is !num) throw new ArgumentError(other);
-    return JS('num', '# / #', this, other);
+    return JS('double', '# / #', this, other);
   }
 
   num operator *(num other) {
     if (other is !num) throw new ArgumentError(other);
     return JS('num', '# * #', this, other);
   }
 
   num operator %(num other) {
     if (other is !num) throw new ArgumentError(other);
     // Euclidean Modulo.
@@ skipping 199 matching lines @@
 }
 
 class JSDouble extends JSNumber implements double {
   const JSDouble();
   Type get runtimeType => double;
 }
 
 class JSPositiveInt extends JSInt {}
 class JSUInt32 extends JSPositiveInt {}
 class JSUInt31 extends JSUInt32 {}