[issue3421] Test failure in test_math::testSum

[Georg Brandl]

Georg Brandl <georg at python.org> added the comment:

Both trunk and 3k give this:

>>> 1e16 + 2.9999
10000000000000004.0
>>> 1.7976931348623157e+308 + 9.979201547673598e+291
inf

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