Unwrap y::UnionALL eagerly when x<:y if x isa ∀-var.
#49023
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N5N3
added
types and dispatch
oscardssmith
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Xnartharax
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Since we never change
∀-var's bound thus eagerUnionALLunwrapping should be pretty safe.The subtyping fix also resolves some soundness issues of intersections.
Close #45874