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

[Avram]

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

Checking for presence and then falling through to the <=3.8 behavior as in the patch, seems reasonable. The default magic method behavior presumably comes out of research, trial, and error. If the docs need to be clearer, I think that's different that scrapping the whole approach.

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<https://bugs.python.org/issue39966>
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