float_divmod(): the code wasn't sick enough to stop the MS optimizer
from optimizing away mod's sign adjustment when mod == 0; so it got
the intended result only in the debug build.
diff --git a/Objects/floatobject.c b/Objects/floatobject.c
index 7e12a09..cdc9620 100644
--- a/Objects/floatobject.c
+++ b/Objects/floatobject.c
@@ -476,7 +476,7 @@
fmod returns different results across platforms; ensure
it has the same sign as the denominator; we'd like to do
"mod = wx * 0.0", but that may get optimized away */
- mod = 0.0;
+ mod *= mod; /* hide "mod = +0" from optimizer */
if (wx < 0.0)
mod = -mod;
}