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We have behaviour divergence for act() between prod and dev (specifically, act() + concurrent mode does not flush fallbacks in prod. This doesn't affect anyone in OSS yet) We also don't have a good story for writing tests in prod (and what from what I gather, nobody really writes tests in prod mode). We could have wiped out act() in prod builds, except that _we_ ourselves use act() for our tests when we run them in prod mode. This PR is a compromise to all of this. We will log a warning if you try to use act() in prod mode, and we silence it in our test suites.