RFC: centralise registries

[Ian Clatworthy]

Robert Collins wrote:
> On Tue, 2009-04-14 at 15:45 +1000, Ian Clatworthy wrote:

> Do you have alternate suggestions to fix the problem?

Putting all subclasses of something into a module in order
to fix a performance issue just *yells* anti-pattern to me.
I thought we wanted to break things like builtins.py apart,
not repeat the mistake.

If we need a central location of globals that always get
loaded, I'd create a module for that called globals.py say.
But I'd prefer that we put as little into it as necessary
and kept things as distributed and localised across the code
base as we can.

Ian C.