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

Note that this pure Python gives the same result:

>>> "%.0f" % float(1639873214337061279)
'1639873214337061376'

That's not surprising:  int -> float conversion is limited to the precision of 
a Python float, which is a C double, which is almost certainly just 53 (not 64) 
significant bits.

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nosy: +tim.peters

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue36934>
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