[daemon] Fix return type change to optional in generic function #16342
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Previously changing a return type to an optional type was not propagated at least in some cases, since astdiff could simplify away the optional type.
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Diff from mypy_primer, showing the effect of this PR on open source code: discord.py (https://github.com/Rapptz/discord.py): typechecking got 1.10x faster (137.4s -> 125.1s)
(Performance measurements are based on a single noisy sample)
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svalentin
approved these changes
Oct 27, 2023
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Previously changing a return type to an optional type was not propagated at least in some cases, since astdiff could simplify away the optional type.