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This fixes a corner case where a bug is caused, counter-intuitively, by an over-estimated intersection. We have method signatures A and B, with A<B (A is a strict subtype). We have a dispatch tuple X, where X<:B and !(X<:A). However, intersection returns X for intersect(X,A). Since there appears to be a match there and A<B, ml_matches skips the match with B. The fix just requires dispatch tuples to be a subtype of a signature in order to match at all.
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