Previously the subtype was encoded above the suptype. This was an issue
if you wanted to, say, traverse all tags in a given suptype.
I'm not sure yet if this sort of functionality is needed, it may be
useful for cleaning up/replacing classes of tags, such as file struct
tags, but not sure yet. At the very least is avoids unintuitive tag
ordering in the tree, which could potential cause problems for
create/deletes.
New encoding:
tags:
iiiiiii iiiiitt ttTTTTT TTT0trv
^----^--------^-^^^- 16-bit id
'--------|-'||- 5-bit suptype (split)
'--||- 8-bit subtype
'|- perturb/remove bit
'- valid bit
lllllll lllllll lllllll lllllll
^- n-bit length
alts:
wwwwwww wwwwwww wwwwwww www1dcv
^^^-^- 28-bit weight
'|-|- color bit
'-|- direction bit
'- valid bit
jjjjjjj jjjjjjj jjjjjjj jjjjjjj
^- n-bit jump
Also a large amount of name changes and other cleanup.
Christopher Haster
4aabb8f631