Stefan Krah added the comment:
OK, but for example:
Help on function __truediv__ in module decimal:
__truediv__(self, other, context=None)
Return self / other.
Here I think it's undisputed that a C version should not cram a context
argument into a number method. There are many functions in decimal where
some arguments are just implementation details, or worse, leftovers
(see #10650).
So I simply don't know if localcontext(None) was intended or (once)
an implementation detail.
localcontext(None) by itself looks kind of awkward to me. The only valid
use case I can see is indeed the one from #15136.
I don't particularly mind either way for localcontext(), but in more
speed sensitive areas I would care.
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<http://bugs.python.org/issue15783>
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