function isNonPositiveInteger( value ) {
	return (
		isInteger( value ) &&
		value.valueOf() <= 0
	);
}
Tests if a value is a number object having a nonpositive integer value.

@param {*} value - value to test
@returns {boolean} boolean indicating if a value is a number object having a nonpositive integer value

@example
var bool = isNonPositiveInteger( -3.0 );
// returns false

@example
var bool = isNonPositiveInteger( new Number( -3.0 ) );
// returns true