plain/rich/subtree differences

[Robert Collins]

Hi Aaron, as you guessed I am writing a new serialiser. I'm not aiming
for composition or other things yet, in this iteration I'm aiming to
just finish making commit scale well.

I'd rather not require everyone move to subtrees, nor write 3
serialisers, so I'm writing one that can be parameterised.

heres what I understand the differences to be:
subtree:
  / is versioned and has a fileid that may be TREE_ROOT
  paths other than / can be 'tree-reference' kinds
rich-roots:
  / is versioned has has a fileid that may be TREE_ROOT
plain:
  / has no last-modified revision and must have the id TREE_ROOT

Can you confirm or correct me :).

-Rob
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