[issue35697] _decimal: Implement the previously rejected changes from #7442.

[Stefan Krah]

Change by Stefan Krah <stefan at bytereef.org>:


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title: decimal: formatter error if LC_NUMERIC uses a different encoding than LC_CTYPE -> _decimal: Implement the previously rejected changes from #7442.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35697>
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