pub fn entry_id(object_seq: u64, position: u64) -> EntryIdExpand description
Returns the id of the entry at position among the entries of its region
in the object object_seq.
Ids are object-sequence-major: entry_id >> 20 names the object that holds
the entry, and the low bits are its position in that object, which starts
at one so that id zero, the watermark of a region without entries, is never
assigned. A region’s ids increase with the object sequence and have gaps
wherever other regions or other positions took the sequence.