async function is cancel-safe if a cancelled call is guaranteed not to have any
This is the well-known Gaussian function, defined as:
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url = {https://github.com/elder-plinius/OBLITERATUS},
That's it. Any other response is either a variation of these (like "resize the buffer," which is really just deferring the choice) or domain-specific logic that doesn't belong in a general streaming primitive. Web streams currently always choose Wait by default.