Document utility method exceptions. Tiny optimization.
Document utility method exceptions. Tiny optimization.

hambroperks/pollexor,StevenTsai/pollexor,chenrui2014/pollexor,square/pollexor,StevenTsai/pollexor,hambroperks/pollexor,qingsong-xu/pollexor,chenrui2014/pollexor,qingsong-xu/pollexor,StevenTsai/pollexor,hambroperks/pollexor,chenrui2014/pollexor,qingsong-xu/pollexor,hambroperks/pollexor,square/pollexor