Drop a registered-but-unawaited request id (e.g. when sending the request frame failed so a response will never arrive). Idempotent; unknown ids are ignored. Keeps the waiter table from leaking when register is not followed by await.
Drop a registered-but-unawaited request id (e.g. when sending the request frame failed so a response will never arrive). Idempotent; unknown ids are ignored. Keeps the waiter table from leaking when register is not followed by await.