dart-lang/js-interop — pull request #93 by a14n (2013-07-03 20:01:18+00:00)
Title: operator==, no hashcode

Getting warnings from dart2js as of Dart SDK version 0.1.2.0_r24721

packages/js/js.dart:987:11: Hint: The class "Proxy" overrides "operator==", but not "get hashCode".
operator==(other) => identical(this, other)

There are a few cases.