Tim Peters added the comment:
FYI, where x = 1.0 - 2.**-53, I believe it's easy to show this under IEEE
double precision arithmetic:
For every finite, normal, double y > 0.0,
IEEE_multiply(x, y) < y
under the default (nearest/even) rounding mode. That implies
int(x*i) < i
for every int i > 0 representable as an IEEE double (including monstrous ints
like 123456789 << 300).
Which makes your output _extremely_ surprising, Steven ;-)
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<http://bugs.python.org/issue24546>
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