method
<=>
![Some documentation Importance_1](https://d2vfyqvduarcvs.cloudfront.net/images/importance_1.png?1349367920)
<=>(p1)
public
Returns zero if number equals other, otherwise nil is returned if the two values are incomparable.
<=>(p1)
public
Returns zero if number equals other, otherwise nil is returned if the two values are incomparable.