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Is there a reason `broadcastIn` for `Flow` is not `@ExperimentalCoroutinesApi` but still `@FlowPreview` in 1.3.0-M1?

It is not clear yet if broadcast channel are there to stay in the long term or if shared flows will replace them. 

<@U2E974ELT>  In general, what is the difference between `FlowPreview` and `ExperimentalCoroutinesApi`? Are there actually stronger guarantees/expectations around the latter?

Yes. Experimental is generally belived to become stable in the future, unless serious problems found. Preview is just a pure preview. Will highly likely change

(none of them is stable, just level of probability to become one is different)