nested trees design-approach : composite trees vs iter_changes

[Ian Clatworthy]

Robert Collins wrote:
> I've been concerned about CompositeTree as an approach for a while, but
> we haven't been able to actually get anywhere in discussing it; today
> Aaron asked broadly that I either veto, or stop complaining. I hadn't
> wanted to veto the vote because that seems to block people vs trying to
> change their mind; however Aaron feels that this will force some
> discussion to resolve it... so I've rejected in BB, and this mail is
> hopefully sufficient to get discussion going.
>
>   
Thanks for articulating your concerns.

As best I can tell, your concerns are largely internal, implementation
issues that don't impact end users. Can you give a concrete example of
when the user experience will be unacceptable if the proposed code lands?

Ian C.