function isnan( value ) {
	return ( isPrimitive( value ) || isObject( value ) );
}
Tests if a value is `NaN`.

@param {*} value - value to test
@returns {boolean} boolean indicating whether value is `NaN`

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

@example
var bool = isnan( new Number( NaN ) );
// returns true

@example
var bool = isnan( 3.14 );
// returns false

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