Stefan Krah added the comment:
Regarding Decimal:
1) The context precision isn't used for formatting. If you have
another reason for proposing the optional context argument for
dec_format(), please open another issue.
2) There's another problem: The mythical DefaultContext (which
acts as a template for creating new contexts) affects not only
new thread-local contexts, but also a new Context()!
In my opinion this is something we should change: The mechanism
is fine for thread-local contexts, but Context() should behave
like a pure function.
3) The double rounding issues are more tricky than it might seem;
if we use Decimal for this, perhaps direct support in the module
would be the cleanest option.
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<http://bugs.python.org/issue23602>
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