Larry Hastings added the comment:
Optional groups were designed to support two specific legacy use cases:
* functions that have groups of parameters that are
* functions with optional parameters to the left of required parameters
They are not intended to be used in cases like this. I really, really wish you
would stop using them except for these specific legacy cases.
Furthermore, the argument parsing for tkinter.tkapp.wantobjects has a very
clear translation into Argument Clinic:
value: int = -1
/
Optional groups should not be used for single-argument functions. I have no
interest in fixing this bug.
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<http://bugs.python.org/issue24051>
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