Tim Peters <t...@python.org> added the comment:

Mark, ya, I agree it's most prudent to let sleeping dogs lie.

In the one "real" complaint we got (issue 24546) the cause was never determined 
- but double rounding was ruled out in that specific case, and no _plausible_ 
cause was identified (short of transient HW error).

As the years go by, my interest in "doing something" about a bug nobody has 
apparently encountered in the wild, and remains theoretically possible on an 
ever-diminishing number of platforms ("32-bit Linux not using faster SSE 
arithmetic" seems to be the universe), has faded somewhat  ;-)

So I'd close as "won't fix".  If I had to do something, I'd add different 
implementations under an "if this box does double-rounding" import-time test so 
nobody else has to pay for it.

But I'm cool with whatever Raymond settles for.

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<https://bugs.python.org/issue24567>
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