Added sanity checks to simple_length methods Added object type and length type checking in the addition and subtraction helper methods in simple_length.js
Added sanity checks to simple_length methods
Added object type and length type checking in the addition and subtraction helper methods in simple_length.js

anthony-huang/typed-om,css-typed-om/typed-om,wilddamon/typed-om,css-typed-om/typed-om,wilddamon/typed-om,samthor/typed-om,anthony-huang/typed-om,samthor/typed-om