[Omaha.pm] Class::Date - change once set

[Jay Hannah]

> So Class::Date objects are immutable, and I only copied references, and
> it is not really Class::Date specific what you copy with swap1.
> 
> Please understand how the @_ variable work! (But before it, understand
> what references are. :-) )
> 
> If you need help, just write!

Since I don't even know what "immutable" means, I must not understand. -grin-  Let me study your example and get back to you.

Thanks for the lesson! 

j