Hi Eric,

I'd like to install something like the patch below into Emacs's master.
What it does (along with various other side changes) is shorten the
object header from 3 fields (the constant `object', the class name, and
an object "name" field) to just one (an interned symbol with an "eieio-"
prefix, referring to the class object).
Among the side things it does, I'd mention:
- add "eieio--" prefixes to a few more entities.
- use hashtables rather than obarrays.
- use closures instead of backquoted lambdas.
- use call-next-method in the various definitions of `clone'.
- redirect defmethods when called on an alias.
- use class objects (vectors) rather than class names (symbols) at more places.

Any objection?


        Stefan