[RFC] Reduce memory with Key and Keys (and improve performance)

[Robert Collins]

On Thu, 2009-09-10 at 16:01 -0500, John Arbash Meinel wrote:

> Given the 10%-ish memory reduction, and the fairly impressive speed
> improvement, I'm thinking it is probably worth investigating this further.

I'm very much in favour of investigating this further.

I think it would be good to complete a transition to a single large
keyspace in the future, e.g. ('texts', fileid, revid). This would
further drive memory overhead with tuple (or object) keys.

We could look at using real objects in the pure python version; and
being able to add methods, or having key/keys pun with tuples. I don't
have a deep opinion, other than to say that objects are nice.

-Rob
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