[issue21407] Add function signatures to _decimal

[Roundup Robot]

New submission from Roundup Robot:

New changeset 40b06a75d1c6 by Stefan Krah in branch 'default':
Issue #21407: _decimal now supports function signatures.
http://hg.python.org/cpython/rev/40b06a75d1c6

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nosy: +python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21407>
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