Stricter checking for base arg.
Stricter checking for base arg.

oberhamsi/ringojs,Transcordia/ringojs,Transcordia/ringojs,oberhamsi/ringojs,ashwinrayaprolu1984/ringojs,Transcordia/ringojs,ringo/ringojs,ringo/ringojs,oberhamsi/ringojs,ashwinrayaprolu1984/ringojs,ashwinrayaprolu1984/ringojs,ringo/ringojs,ringo/ringojs,Transcordia/ringojs,ashwinrayaprolu1984/ringojs