Opaque cloned per-slice payload; the owning loader casts it back.
Total retained bytes (payload typed arrays + stage.bytes).
OptionalladderStored additive prefix depth, when the entry represents a ladder.
OptionaltotalTotal additive ladder depth for the node that produced this entry.
OptionalstageDerived stage output (projection), admitted only into spare budget.
One cached per-slice entry.
payloadis opaque (the owning loader's cloned decoded-slice snapshot);bytesis the retained size used for LRU accounting — the payload's measured size plus the attached stage output's, when there is one.