Fixed bug that results in incorrect type isinstance or issubclass…
#8243
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… type narrowing when using a type variable with an upper bound that includes a promotion type. This addresses #8238.
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Diff from mypy_primer, showing the effect of this PR on open source code: dd-trace-py (https://github.com/DataDog/dd-trace-py)
+ /tmp/mypy_primer/projects/dd-trace-py/ddtrace/internal/compat.py:198:18 - error: Cannot access attribute "decode" for class "memoryview*"
+ Attribute "decode" is unknown (reportAttributeAccessIssue)
- 11621 errors, 583 warnings, 0 informations
+ 11622 errors, 583 warnings, 0 informations
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… type narrowing when using a type variable with an upper bound that includes a promotion type. This addresses #8238.