Try to fix problems caused by in-place modification of typevar defaults #19382
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According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅ |
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Fixes #19186. Fixes #19185. Fixes #19192. Fixes behavior in #14851 (comment) (note that assert_type should fail with bare class, it is still generic until actually used unsubscripted).
I do not know yet whether these changes are actually valid. Let's check the primer output and run all tests first.