The entry these payloads came from. A loader that builds its returned data
from lods ALONE (no newly loaded level) stamps that result with it, so
the post-projection stage cache can recognise a revisit of the same slice
data (see cache/slice-cache-origin.ts).
A restored progressive snapshot.
lodsis the retained payload container;depthis the logical loaded-level count and may exceedlods.lengthwhen a loader folds several levels into one cumulative payload.