[issue20214] Argument Clinic rollup fixes

[Larry Hastings]

Larry Hastings added the comment:

Third patch, with these new features:

* Relaxed rules regarding c_default and py_default; they can now be
  used even when no default value is supplied.
* Added bool return converter.
* Made one fail() call easier to read, through the power of str.format().
* More doc updates and fixes.

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Added file: http://bugs.python.org/file33432/larry.argument.clinic.misc.fixes.patch.3.txt

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