Fixed recent regression in isinstance type narrowing logic that aff…
#9588
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…ects the case where the filter type is a metaclass. This addresses #9441.
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Diff from mypy_primer, showing the effect of this PR on open source code: sympy (https://github.com/sympy/sympy)
+ /tmp/mypy_primer/projects/sympy/sympy/polys/polyoptions.py:73:9 - error: Argument of type "Self@OptionType" cannot be assigned to parameter "value" of type "type[Option]" in function "__setitem__"
+ Type "Self@OptionType" is not assignable to type "type[Option]" (reportArgumentType)
- 32398 errors, 67 warnings, 0 informations
+ 32399 errors, 67 warnings, 0 informations
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…ects the case where the filter type is a metaclass. This addresses #9441.