Case insensitive dict

[Joseph L. Casale]

I was doing some work with the ldap module and required a ci dict that was case
insensitive but case preserving. It turned out the cidict class they implemented was
broken with respect to pop, it is inherited and not re implemented to work. Before
I set about re-inventing the wheel, anyone know of a working implementation?

I noticed twisted has one but it seems to omit pop.

Thanks!
jlc