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Either module (mirrors OCaml 4.12+ stdlib): left x / right x is_left / is_right find_left / find_right (return Option) map_left / map_right (single-side mappers) fold lf rf e (case dispatch) equal eq_l eq_r a b compare cmp_l cmp_r a b (Left < Right) Constructors are bare 'Left x' / 'Right x' (OCaml 4.12+ exposes them directly without an explicit type-decl). Hashtbl.copy: build a fresh cell with _hashtbl_create walk _hashtbl_to_list and re-add each (k, v) mutating one copy doesn't touch the other (Hashtbl.length t + Hashtbl.length t2 = 3 after fork-and-add verifies that adds to t2 don't appear in t)