Micro-optimization: Avoid temporary set creation in is_proper_subtype #19463
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This is a part of a set of micro-optimizations that improve self check performance by ~5.5%.
JukkaL changed the title 
| According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅ |
sterliakov approved these changes Jul 16, 2025
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This was suggested by @sterliakov in #19384 (comment)
This is a part of a set of micro-optimizations that improve self check performance by ~5.5%.