[riffraff]

I believe he means the stuff that happens in js like 111111111111111110000 + 1111 = 111111111111111110000;

EDIT: not a javascript specific thing, rather a float one, methinks

[chimeracoder]

To clarify, they are basic floating-point errors from C that happen to be errors for integers as well in Javascript, because Javascript does not support fixed-precision integers.