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function BuildEventIter.drain 
def BuildEventIter.drain() -> None | bool
Stop iterating: unsubscribe, drop buffered events. Idempotent. function BuildEventIter.try_pop 
def BuildEventIter.try_pop() -> None | build_event
Non-blocking pop. Returns None when empty or disconnected. Events are already kinds=-filtered send-side, so whatever is buffered is wanted.