pub fn hash_table_bytes(entries: u64, entry_bytes: u64) -> Option<u64>Expand description
2026-10-02: Bytes of a Rust HashMap (hashbrown) holding entries entries of
entry_bytes each (a multiple of 16), as it grows by inserting them: buckets are the next
power of two of entries * 8 / 7 (4 or 8 below 8 entries; hashbrown capacity_to_buckets),
each bucket one entry plus one control byte, plus one 16-byte control group. 0 entries hold no
allocation.