This fixes#1240.
In internals/path.py. there is a snippet of code that multiples mtime
for a file with 1000, and then casting it to `int`, to return the number
of milliseconds since epoch (or whatever). This will, however, not
ensure that the result is an `int`.
>>> type(int(2**32))
<type 'long'>
Instead, fix the tests to look for (int, long), and clarify the
implementation.
This bug found on a 32-bit VM :)
