I think this is a great idea 
I was actually also working on a PEP for this idea (not ready yet), and I have an implementation as well (ready-ish). I was about to post about it next week 
I will try to review your PEP, but after a quick read: do you think this should also work for async comprehensions? I see in your implementation it is handled, but there are no mentions of this in the PEP (personally, I lean towards yes for consistency).
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