function isNonPositiveNumber( value ) {
	return (
		isNumber( value ) &&
		value.valueOf() <= 0.0
	);
}
Tests if a value is a number object having a nonpositive value.

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

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

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