[pull] master from facebook:master#410
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pull[bot] merged 3 commits intoJCofman:masterfrom Mar 20, 2021
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We don't need this anymore. It only existed so we could cancel the callback later. But canceling isn't necessary, was only an "optimization" for something that almost never happens in practice.
We added this unstable feature a few years ago, as a way to opt out of context updates, but it didn't prove useful in practice. We have other proposals for how to address the same problem, like context selectors. Since it was prefixed with `unstable_`, we should be able to remove it without consequence. The hook API already warned if you used it. Even if someone is using it somewhere, it's meant to be an optimization only, so if they are using the API properly, it should not have any semantic impact.
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