warn user if bit is larger than pocket size.

[bakedPotatoLord]

Keeps issues like this from occurring.

[stewartoallen]

not sure what algorithm you envisioned for this, but I can't think of anything elegant

[bakedPotatoLord]

I was thinking of checking if the first offset has less polys than the original slice. wouldn't catch all cases, but it would be fast and catch the most obvious ones.