The “Usage” section in the readme doesn’t even give you any information about how it behaves on inputs that aren’t numbers. I hope the is-odd package has some way of detecting whether the input is a number or not. Maybe other packages need this too!

    isEven(0);
    //=> true
    isEven('1');
    //=> false
    isEven(2);
    //=> true
    isEven('3');
    //=> false