[Python-Dev] Revised decimal type PEP

[Aahz Maruch]

Guido van Rossum wrote:
> 
> int/long < decimal < rational < float < complex
> \---------------------------/   \-------------/
>             exact                  inexact

Note that in Cowlishaw's implementation of decimal numbers, decimals are
*not* exact.  Truncation (rounding), overflow, and underflow errors can
occur under addition, subtraction, and multiplication.  It's trivial to
set them to be unbounded, but then Cowlishaw provides no mechanism for
determining the truncation of division.
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