Stefan Krah <stefan-use...@bytereef.org> added the comment:
I'd prefer to drop the ExtendedContext completely. Reasons are:
1) _clamp, prec, emin and emax aren't set to IEEE754 values.
2) The use of 'extended' is decNumber specific (see
http://speleotrove.com/decimal/dncont.html ). In IEEE754
'extended' has yet another meaning (AFAICS).
I can see that it is awkward to remove it, but if there's consensus
I'd be willing to work on a patch.
Making clamp visible sounds fine to me. (Personally, I'd rather have
capitals non-visible.)
If we make Decimal{32,64,128} contexts available, we should document exactly
how the arithmetic deviates from IEEE754.
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<http://bugs.python.org/issue8540>
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