function isNumber( value ) {
	return ( isPrimitive( value ) || isObject( value ) );
}
Tests if a value is a number.

@param {*} value - value to test
@returns {boolean} boolean indicating whether value is a number

@example
var bool = isNumber( 3.14 );
// returns true

@example
var bool = isNumber( new Number( 3.14 ) );
// returns true

@example
var bool = isNumber( NaN );
// returns true

@example
var bool = isNumber( null );
// returns false