[issue46642] typing: tested TypeVar instance subclass TypeError is incidental

[Gregory Beauregard]

Change by Gregory Beauregard <greg at greg.red>:


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keywords: +patch
pull_requests: +29324
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/31148

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<https://bugs.python.org/issue46642>
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