perf: use hasExprMvar in type class search
#4276
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The spurious Mathlib failure from lake being noisy in tests should hopefully be resolved by tomorrow. |
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I'm wondering if this change has a significant effect on Mathlib, because there might be lots of universe metavariables flying around there that we don't care about.
Closes #0000 (
RFCorbugissue number fixed by this PR, if any)