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While creating Gerrit reviews is the preferred approach to contribute to the Dart SDK, contributors sometimes create PRs, anyway.
For administrators: GitHub PRs MUST NOT be merged on GitHub for the SDK repo. Merging a GitHub PR directly breaks mirroring and the repository will be closed until mirroring is restored.
Instead, GitHub PRs are automatically synced to Gerrit if their owner has signed the CLA. They can be submitted like any other patch in Gerrit.