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> while keeping it somewhat WSGI-compatible

There's the problem. WSGI is fundamentally flawed too - it could also be using generators for a two-way communication channel instead of stringly typed callbacks.

In a world where Python has optional static type hints, it would be nice to have concrete objects passed too.

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Can you expand on the stringly typed callbacks? Where are they required? Are you referring to string keys in a callback dictionary, in which case stringly-typed seems a bit of an odd choice of words.

Calling the receive async function gets you a dictionary with a string type key, which defines the layout of the dictionary. It's not nice.

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