Sentinel for "no entity": the last representable id (the maximum local index
in the last quadrant, which is numerically -1). The allocator issues local
indices from 0 upward and a quadrant fills up long before 2^30 entities, so
no live entity ever equals this — locate/read resolve it to null. Use it
where a lookup may have no answer; it is not a live entity, so never
insert/delete/update it.
Sentinel for "no entity": the last representable id (the maximum local index in the last quadrant, which is numerically -1). The allocator issues local indices from 0 upward and a quadrant fills up long before 2^30 entities, so no live entity ever equals this —
locate/readresolve it to null. Use it where a lookup may have no answer; it is not a live entity, so never insert/delete/update it.