function createRound(methodName) {
	      var func = Math[methodName];
	      return function(number, precision) {
	        precision = precision === undefined ? 0 : (+precision || 0);
	        if (precision) {
	          precision = pow(10, precision);
	          return func(number * precision) / precision;
	        }
	        return func(number);
	      };
	    }
Creates a `_.ceil`, `_.floor`, or `_.round` function.

@private
@param {string} methodName The name of the `Math` method to use when rounding.
@returns {Function} Returns the new round function.