Against PEP 240

[Aahz Maruch]

In article <3b16a5e2.10711472 at wa.news.verio.net>,
Bengt Richter <bokr at accessone.com> wrote:
>
>Note the following "recovery" of exactness, assuming the result has
>two legitimate decimals ;-)
>
> >>> 0.98
> 0.97999999999999998
> >>> "%4.2f" % (.98,)
> '0.98'

That's what Python used to do.  Problem is, error propagates rapidly,
especially with multiplication, division, and addition/subtraction of
numbers with differing magnitude.
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