Exposing native doubles as doubles when they are read-only or method return values.

sdk/lib/web_audio/dart2js/web_audio_dart2js.dart

 library dart.dom.web_audio;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:_collection-dev' hide deprecated;
 import 'dart:html';
 import 'dart:html_common';
 import 'dart:typed_data';
 import 'dart:_js_helper' show Creates, JSName, Returns, convertDartClosureToJS;
 import 'dart:_foreign_helper' show JS;
@@ skipping 56 matching lines @@
 
 
 @DocsEditable()
 @DomName('AudioBuffer')
 // https://dvcs.w3.org/hg/audio/raw-file/tip/webaudio/specification.html#AudioBuffer-section
 @Experimental()
 class AudioBuffer extends Interceptor native "AudioBuffer" {
 
   @DomName('AudioBuffer.duration')
   @DocsEditable()
-  final num duration;
+  final double duration;
 
   @DomName('AudioBuffer.gain')
   @DocsEditable()
   num gain;
 
   @DomName('AudioBuffer.length')
   @DocsEditable()
   final int length;
 
   @DomName('AudioBuffer.numberOfChannels')
   @DocsEditable()
   final int numberOfChannels;
 
   @DomName('AudioBuffer.sampleRate')
   @DocsEditable()
-  final num sampleRate;
+  final double sampleRate;
 
   @DomName('AudioBuffer.getChannelData')
   @DocsEditable()
   Float32List getChannelData(int channelIndex) native;
 }
 // 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.
 
 // WARNING: Do not edit - generated code.
@@ skipping 120 matching lines @@
 
   /// Checks if this type is supported on the current platform.
   static bool get supported => JS('bool', '!!(window.AudioContext || window.webkitAudioContext)');
 
   @DomName('AudioContext.activeSourceCount')
   @DocsEditable()
   final int activeSourceCount;
 
   @DomName('AudioContext.currentTime')
   @DocsEditable()
-  final num currentTime;
+  final double currentTime;
 
   @DomName('AudioContext.destination')
   @DocsEditable()
   final AudioDestinationNode destination;
 
   @DomName('AudioContext.listener')
   @DocsEditable()
   final AudioListener listener;
 
   @DomName('AudioContext.sampleRate')
   @DocsEditable()
-  final num sampleRate;
+  final double sampleRate;
 
   @DomName('AudioContext.createAnalyser')
   @DocsEditable()
   AnalyserNode createAnalyser() native;
 
   @DomName('AudioContext.createBiquadFilter')
   @DocsEditable()
   BiquadFilterNode createBiquadFilter() native;
 
   @DomName('AudioContext.createBuffer')
@@ skipping 241 matching lines @@
 
 
 @DocsEditable()
 @DomName('AudioParam')
 // https://dvcs.w3.org/hg/audio/raw-file/tip/webaudio/specification.html#AudioParam
 @Experimental()
 class AudioParam extends Interceptor native "AudioParam" {
 
   @DomName('AudioParam.defaultValue')
   @DocsEditable()
-  final num defaultValue;
+  final double defaultValue;
 
   @DomName('AudioParam.maxValue')
   @DocsEditable()
-  final num maxValue;
+  final double maxValue;
 
   @DomName('AudioParam.minValue')
   @DocsEditable()
-  final num minValue;
+  final double minValue;
 
   @DomName('AudioParam.name')
   @DocsEditable()
   final String name;
 
   @DomName('AudioParam.units')
   @DocsEditable()
   final int units;
 
   @DomName('AudioParam.value')
@@ skipping 600 matching lines @@
 // 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.
 
 
 @DocsEditable()
 @DomName('WaveTable')
 // https://dvcs.w3.org/hg/audio/raw-file/tip/webaudio/specification.html#WaveTable-section
 @Experimental()
 class WaveTable extends Interceptor native "WaveTable" {
 }