[issue29301] decimal: Use FASTCALL and/or Argument Clinic

[Ma Lin]

Ma Lin <malincns at 163.com> added the comment:

> AC will not happen: It makes the module too large and unreadable.

AC has great performance improvements these days: issue35582 and issue36127
It's quite worthy of reconsidering this decision.

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nosy: +Ma Lin

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<https://bugs.python.org/issue29301>
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