Special-case unions in polymorphic inference#16461
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ilevkivskyi merged 1 commit intopython:masterfrom Nov 13, 2023
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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 1.08x slower (173.5s -> 186.8s)
(Performance measurements are based on a single noisy sample)
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JukkaL
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This looks a bit ad-hoc, but I can't propose a better way of solving the issue.
The use case that this supports seems sufficiently fundamental that it would be unfortunate not to support it. Empty mypy_primer output indicates that this is likely a net improvement. Looking for a more principled approach in the future would be nice, though.
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@JukkaL Yeah. I was thinking about re-working union inference in general. But so far it seems to me whatever we do, we will need some kind of special-casing (at least for types like |
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Nov 22, 2023
Fixes #16451 This special-casing is unfortunate, but this is the best I came up so far.
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Fixes #16451
This special-casing is unfortunate, but this is the best I came up so far.