[issue39966] mock 3.9 bug: Wrapped objects without __bool__ raise exception

[Avram]

Avram <python at avram.us> added the comment:

They are documented. That said, the subsection section could use a header.

https://docs.python.org/3/library/unittest.mock.html#magic-mock

Patch looks good! Can't think of any other test scenarios right now.

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