Backport "Fix signature computation and caching involving type variables " to LTS#19107

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Kordyjan merged 7 commits intorelease-3.3.2from

Dec 8, 2023

Commits on Nov 30, 2023

Move tupleArity to TypeErasure and document its shortcomings

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TypeErasure: Rename `wildcardOK` to `inSigName`

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Fix signature computation involving nested type variables

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Fix signature caching involving type variables

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Add FIXMEs regarding TypeVar#resetInst breaking our caching logic

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TypeErasure#apply: replace ensuring by inlinable assert for performance

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TypeErasure#apply: use WildcardType instead of null

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