• Added Promise#finally stage 3 proposal, #225
• Added Promise.try stage 1 proposal
• Added Array#flatten and Array#flatMap stage 1 proposal
• Added .of and .from methods on collection constructors stage 1 proposal:
  • Map.of
  • Set.of
  • WeakSet.of
  • WeakMap.of
  • Map.from
  • Set.from
  • WeakSet.from
  • WeakMap.from
• Added Math extensions stage 1 proposal, #226:
  • Math.clamp
  • Math.DEG_PER_RAD
  • Math.degrees
  • Math.fscale
  • Math.RAD_PER_DEG
  • Math.radians
  • Math.scale
• Added Math.signbit stage 1 proposal
• Updated global stage 3 proposal - added global global object, System.global deprecated
• Updated Object.getOwnPropertyDescriptors to the final version - it should not create properties if descriptors are undefined
• Updated the list of iterable DOM collections, #249, added:
  • CSSStyleDeclaration#@@iterator
  • CSSValueList#@@iterator
  • ClientRectList#@@iterator
  • DOMRectList#@@iterator
  • DOMStringList#@@iterator
  • DataTransferItemList#@@iterator
  • FileList#@@iterator
  • HTMLAllCollection#@@iterator
  • HTMLCollection#@@iterator
  • HTMLFormElement#@@iterator
  • HTMLSelectElement#@@iterator
  • MimeTypeArray#@@iterator
  • NamedNodeMap#@@iterator
  • PaintRequestList#@@iterator
  • Plugin#@@iterator
  • PluginArray#@@iterator
  • SVGLengthList#@@iterator
  • SVGNumberList#@@iterator
  • SVGPathSegList#@@iterator
  • SVGPointList#@@iterator
  • SVGStringList#@@iterator
  • SVGTransformList#@@iterator
  • SourceBufferList#@@iterator
  • TextTrackCueList#@@iterator
  • TextTrackList#@@iterator
  • TouchList#@@iterator
• Updated stages of proposals:
  • Object.getOwnPropertyDescriptors to stage 4 (ES2017)
  • String padding to stage 4 (ES2017)
  • global to stage 3
  • String trimming to stage 2
• Updated typed arrays to the modern (ES2016+) arguments validation,
  #293
• Fixed %TypedArray%.from Safari bug, #285
• Fixed compatibility with old version of Prototype.js, #278, #289
• Function#name no longer cache the result for correct behaviour with inherited constructors, #296
• Added errors on incorrect context of collection methods, #272
• Fixed conversion typed array constructors to string, fix #300
• Fixed Set#size with debugger ReactNative for Android, #297
• Fixed an issue with Electron-based debugger, #230
• Fixed compatibility with incomplete third-party WeakMap polyfills, #252
• Added a fallback for Date#toJSON in engines without native Date#toISOString, #220
• Added support for Sphere Dispatch API, #286
• Seriously changed the coding style and the ESLint config
• Updated many dev dependencies (webpack, uglify, etc)
• Some other minor fixes and optimizations