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Fix typing of attrs.ib with converter and default - #1655
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Fixes #518.
The
attr.ib()stubs inferred the attribute type from thedefaultargument even when aconverterwas passed. Since the converter is applied to the default at runtime,attr.ib(default="1", converter=int)was rejected when assigned to anintattribute. Added an overload that infers the type from the converter's return type and accepts any default value in that case.Verification:
mypy typing_testsplus all stub files:Success: no issues found in 12 source files.pytest tests -q:1407 passed, 4 skipped, 2 xfailed.ruff checkandruff format --checkon the changed files: passed.ConvCDefaultcase intyping_tests/mypy.pyfails before the change withIncompatible types in assignment (expression has type "str", variable has type "int")and passes after it.