[issue1694] floating point number round failures under Linux

[Tim Peters]

Tim Peters added the comment:

Right, Unix-derived C libraries generally do IEEE-754 "round to
nearest/even" rounding, while Microsoft's do "add a half and chop"
rounding.  The Python reference manual says nothing about this, and
neither does the C standard (well, C89 doesn't; unsure about C99).

Python's round() function is independent of the platform C
string<->float conversions, and intentionally does (as documented) "add
a half and chop" rounding.

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nosy: +tim_one

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