I'm trying to make a custom output port that is backed by a
async-channel. One of the operations that ports need to provide is an
event that is ready when progress on the event can be made. But since
I cannot tell if the async-channel is full and put would not block
without actually sending a value, I cannot provide such an event. Is
it possible to provide such an API or does the implementation of
async-channels prevent this?
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