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Replace
isinstance(op, GateOperation)
checks in cirq_google optimiz…
…ers to support other operation types. (#4459) Proliferation of `isinstance(op, GateOperation)` checks results in many inconsistencies due to different available operation types like `ControlledOperations` and `TaggedOperations`. This PR fixes #4152 and is a first step towards fixing #3556 Note that `TaggedOperations` which were earlier ignored by the optimizers would now be considered, and hence this is potentially a breaking change if people were implicitly relying on TaggedOperations not getting compiled by the optimizers. Since the optimizer doesn't document / test this behavior, I consider it to be a bug rather than a feature and an explicit `NoCompile` tag should be implemented as part of #4253 This PR is blocked on submitting #4167 (tests will stop failing once the PR is submitted and this rebased). Update: This is now ready for review.
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