Revert "Improve typesubtract for tuples (#35600)" #37562
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This reverts commit cf0c3e0.
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The before (green) / after (blue) times here are pretty cool to see: The #37714 PR will make them a bit worse than the blue again, but not much (not like the green line). |
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Closes #37448, reopens #35566
Uses of
switchtupleunionneed to be guarded in cost (e.g. withcountunionsplit), while there's currently no practical way to limit this. The inference algorithm assumes that the canonical form is that oftuplemerge, and dislikes when we form the switched version implicitly, as it has a higher lattice cost, so it's expected to only appear explicitly.