[issue23657] Don't do isinstance checks in zipapp

[Paul Moore]

Paul Moore added the comment:

Updated patch with fixes for review comments. I did remove the tests for the exact error messages, as testing for a non-zero exit code was actually what I was trying to do, and I found a better way of doing that.

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Added file: http://bugs.python.org/file38623/duck_typed_zipapp.v4.patch

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