Function jsonb_compare 

pub fn jsonb_compare(a: &JsonValue, b: &JsonValue) -> Ordering

v7.38 (read01 P6.24) — PG’s jsonb total order (ORDER BY / DISTINCT / btree). First by type rank Null < String < Number < Boolean < Array < Object; then within a type: strings by content, numbers numerically, booleans false < true, arrays by length then element-wise, objects by pair-count then key/value pairwise (keys in canonical stored order). Mirrors the observable behaviour of jsonb.c’s compareJsonbContainers.