>
> Also noted that 1000 lookups using DNU took 14 ms, skipping the DNU and
> adding a method which does the lookup brought it down to 7 ms, and
> finally just turning it into a class instvar and returning that took 1
> ms.
>

If you stand really far away, your namespace implementation starts to look 
a lot like the SharedPool class.

That may be a hint to us.