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in one descent, and loop without recursion (020)
- An event's list keyed by a number keeps its keys beside its tree: bits
while they are small whole numbers, else an open-addressing table;
has() reads only that, and inserts, removes, key changes, their undoing
and clears keep it.
- Each thread keeps fingers on the last four leaves it read (list id and
version must match): reads by position and searches by key that land in
them do not descend.
- pure_list_add finds a key's place and inserts there in one descent; a
stored keyed list's appends take it too, journaled as inserts.
- Child searches count over the whole guide; item fields know at load
whether they are text; loops run on a stack of loop records, not by
recursion; module-list.c builds at -O3.
- test-module: the key set and fingers answer as a model at every step
(bits to table, removes inside runs, undone changes, clears, shares),
and a stored keyed list's adds replay from its journal.
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