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First varint is a header. Lowest bit of header is "endsWithSeq".
When expanding, if "endsWithSeq", is set, add the current index to *every*
level of the array?
When adding, the current index is always added at every stage of the path.
In the index, include one entry for subdirectories; take the newest element of
the subdirectory as that entry (which might itself be a deeper nested
subdirectory entry)
There seem to be extra empty arrays everywhere? not sure what's up with that,
maybe I have an off-by-one.
The current path counts as an entry (eg, "/README" decomposes to "/" and
"README", two entries). I'm not sure why... so directories can have entries?
Entry indexes are effectively 1-based (0 is the pubkey entry); don't correct
for this.
In children:
- Changes/edits to a path entirely replace the old entry index with the new
index.
- removals of an entry are done by writing a new entry with the same path, no
stat data, and with all child paths removed (of this index and the old
index).
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