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gh-142737: Handle lost `io.open` in `_Py_FindSourceFile` #225727

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gh-142737: Handle lost `io.open` in `_Py_FindSourceFile`

gh-142737: Handle lost `io.open` in `_Py_FindSourceFile` #225727

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gh-142737: Handle lost io.open in _Py_FindSourceFile #225727

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gh-142737: Handle lost `io.open` in `_Py_FindSourceFile` #225727