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Sun Mar 21 05:40:19 CET 2010 · https://mail.python.org/pipermail/python-dev/2010-March/098637.html

Mark Dickinson wrote:

> Except that float is fixed-width (typically 53 bits of precision),
> while Decimal allows a user-specified, arbitrarily large, precision;

Yes, but it still has *some* fixed limit at any given
moment, so the result of an operation on Decimals always
has the potential to produce an inexact result. It's
not like an int or Fraction where the result can expand
to whatever size is needed.

-- 
Greg

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[Python-Dev] Mixing float and Decimal -- thread reboot