Enhanced the type(y) == x type guard logic to support the case wher…
#9266
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…e `y` is declared as a type variable with an upper bound that overlaps with the type of `x`. This addresses #9227.
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Diff from mypy_primer, showing the effect of this PR on open source code: yarl (https://github.com/aio-libs/yarl)
- /tmp/mypy_primer/projects/yarl/yarl/_url.py:251:20 - error: Type "str | SplitResult | URL" is not assignable to return type "Self@URL"
+ /tmp/mypy_primer/projects/yarl/yarl/_url.py:251:20 - error: Type "str | SplitResult | URL*" is not assignable to return type "Self@URL"
- Type "str | SplitResult | URL" is not assignable to type "Self@URL" (reportReturnType)
+ Type "str | SplitResult | URL*" is not assignable to type "Self@URL" (reportReturnType)
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…e
yis declared as a type variable with an upper bound that overlaps with the type ofx. This addresses #9227.