[ty] Find legacy typevars using a `TypeVisitor` #19625

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dcreager wants to merge 5 commits into main from dcreager/visitor-recursion

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[ty] Find legacy typevars using a `TypeVisitor` #19625

prune when finding legacy typevars

CodSpeed HQ / CodSpeed Performance Analysis failed Jul 29, 2025 in 0s

Performance Regression: -35.67%

Summary

❌ 1 regressions
✅ 40 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	`BASE`	`HEAD`	Change
❌	`DateType`	230.1 ms	357.7 ms	-35.67%

View more details on CodSpeed HQ