Revert "Improve typesubtract for tuples (#35600)" #37562
Merged
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Closes #37448, reopens #35566
Uses of
switchtupleunion
need 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.