Support flow messages for batch size of 1 #326
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The logic for when to send a flow message is currently "if there are fewer outstanding messages than half the batch size, request more" (
if self.remaining_messages < self.batch_size / 2). If batch_size is set to1, this will never run, and the consumer will only ever receive the initial message.By using div_ceil here, we guarantee that when remaining_messages is 0, the consumer will ask for the next message.