Comparison of Enumerations with base type of String?

[Michael Reiland via Digitalmars-d-learn]

whoa, you can use a struct as a basetype for an enum?  I'm 
guessing it allows you to associate more information with the 
enum without using lookup tables and the like?  And equality is 
probably just a memberwise comparison of the struct itself?

That seems interesting like an interesting idea, although I'm not 
sure if I'd ever use it.

I'm mostly just trying to get a feel for how things work 
underneath so I have a general understanding of the performance 
implications of things (in a very general sense).

Thanks for the indepth responses, I've learned a few things from 
them.