No significant bundle size changes to report.

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@threepointone Just to confirm, this isn't supposed to affect prod, right? There are some tests that are failing (correction: one test) but I assume that was just an oversight in the last PR.

I'm going to assume that this doesn't affect prod and we can follow up later if that's not the case. All the act stuff should be dev-only, or alternatively, in a separate testing build.

We use this sigil not just for warnings now, but also for deciding when to flush, so it does actually affect prod?

Is this the only case? We really should not be leaking act behavior into the main production bundles.

What is the use case for running act tests in production?

I think the discussion we had was people might be running tests with prod builds? iirc. Happy to not support it if so, or move to making testing builds.

Since this only affects Concurrent and Sync mode I'll merge this and we can pick up discussion elsewhere.