Contribution Checklist

Feature improves existing core functionality
API is compatible with existing Angular apis and relevant standards (if applicable)
Contributor signed CLA now or in the past (after signing leave a comment here with your real name)
PR contains unit tests
PR contains e2e tests (if suitable)
PR contains documentation update
PR was tested on ci.angularjs.org for cross-browser compatibility
PR is rebased against recent master
PR is squashed into one commit per logical change
PR's commit message is descriptive and allows us to autogenerate release notes (required commit message format)

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