pub const MAX_STORE_ID_LEN: usize = 64; // 64usizeExpand description
Upper bound on a store id, in bytes.
Store ids become path components (stores/{id}/...) and are embedded in
every cause reference of every node that points across a store boundary, so
they are paid for repeatedly in both inodes and bytes-on-disk. 64 is chosen
to match the hash length: a qualified reference is then never more than
~2x a bare one, which keeps the worst case on a node’s caused_by bounded
and predictable. It is also comfortably under the 255-byte filename limit
on every filesystem we target, with room for prefixes and suffixes.