[issue10650] decimal.py: quantize(): excess digits with watchexp=0

[Roundup Robot]

Roundup Robot added the comment:

New changeset e4ca4edee8bd by Stefan Krah in branch 'default':
Closes #10650: Deprecate the watchexp parameter of Decimal.quantize().
http://hg.python.org/cpython/rev/e4ca4edee8bd

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