Fix crash involving recursive union of tuples #17353
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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 #17236
It turns out we were calculating tuple fallbacks where we don't really need to. We can rely on the fact that tuple fallback is trivial for non-trivial partial fallbacks to simplify the logic and avoid the infinite recursion.