ReadonlycapacityMaximum buffered values; must be a positive safe integer.
Optional ReadonlyonSynchronous overflow notification called after updating the queue. Receives one
live statistics object per execution; reentrant drops update its count without
re-entering onDrop. Synchronous throws fail the execution (or are recorded in
suppressedErrors after cancellation or failure). Return values, including
promises, are ignored and not awaited.
Optional ReadonlyoverflowFull-queue policy. Defaults to error; event producers cannot be blocked.
Queue limits for push sources, applied independently to each execution.