Modified the isinstance type narrowing logic to retain a TypeVar wh…
#6439
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…en narrowing in the positive case and the value is not a constrained TypeVar. This addresses #6434.
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Diff from mypy_primer, showing the effect of this PR on open source code: steam.py (https://github.com/Gobot1234/steam.py)
+ /tmp/mypy_primer/projects/steam.py/steam/ext/commands/commands.py:934:18 - warning: Cannot access member "checks" for type "function"
+ Member "checks" is unknown (reportFunctionMemberAccess)
+ /tmp/mypy_primer/projects/steam.py/steam/ext/commands/commands.py:1019:21 - warning: Cannot access member "cooldown" for type "function"
+ Member "cooldown" is unknown (reportFunctionMemberAccess)
+ /tmp/mypy_primer/projects/steam.py/steam/ext/commands/converters.py:224:25 - warning: Cannot access member "special_converters" for type "function"
+ Member "special_converters" is unknown (reportFunctionMemberAccess)
- 8411 errors, 23 warnings, 0 informations
+ 8411 errors, 26 warnings, 0 informations
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…en narrowing in the positive case and the value is not a constrained TypeVar. This addresses #6434.