[issue37564] ArgumentParser should support bool type according to truth values

[paul j3]

paul j3 <ajipanca at gmail.com> added the comment:

The use of `bool` as registry key only works because that object already exists as a builtin.  This amounts a form of shadowing, and sets a dangerous precedent.

    type=bool

should work as documented at

https://docs.python.org/3/library/functions.html?highlight=bool#bool

even if that is not what a casual user would expect.

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<https://bugs.python.org/issue37564>
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