[issue20530] Change the text signature format (again) to be more robust

[Roundup Robot]

Roundup Robot added the comment:

New changeset 29d9638bf449 by Larry Hastings in branch 'default':
Issue #20530: Argument Clinic's signature format has been revised again.
http://hg.python.org/cpython/rev/29d9638bf449

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nosy: +python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20530>
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