@haypo, I've read the PEP and it has great ideas.  What I'm wondering is whether they've been implemented "correctly" in the relevant cases on Windows here.  That Zach see a resolution of 0.0156001 on Windows isn't plausibly a question of rounding errors:  that value appears to be insane.  Yes, it's vaguely close to the 0.015625 I see, but the value I see _is_ sane (being exactly 1/64) - but 0.0156001 isn't close enough to 0.015625 for "rounding errors" to be at all a plausible explanation for why it's so strange.