Having thought about this some more, the function name should of course be jsonb_unnest(), similar to how unnest() works for normal arrays:
SELECT unnest(array[[3,2],[1,4]]); unnest -------- 3 2 1 4 (4 rows) SELECT jsonb_unnest('[[3,2],[1,4]]'::jsonb); jsonb_unnest -------------------- 3 2 1 4 (4 rows) Thoughts?