Is there a way to use the batched message handlers to group all available messages of a certain type together and process them at once? For example I don't have a specific "batch" size that I want to wait for. I just want to group as many messages together at once and then run.

I see this note:

By default, pending batches are flushed when the worker is idle as well as when it is stopped.

which may be relevant: basically I want to aggressively / eagerly flush the batch once I have scanned the queue for any other messages that match the type.