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Ordinary OCaml variants force duplication or wrapper types when modules share overlapping sets of cases. Polymorphic variants solve this — here's a worked config-parser example, plus the exhaustiveness trade-off you need to manage.
Guidance on choosing polymorphic variants versus ADTs/GADTs for heterogeneous data in OCaml, with a JSON‑like example and verification steps.
OCaml polymorphic variants let you build extensible, type-safe data structures without rigid ADT definitions. See a practical expression evaluator example and learn how to verify inferred types.
Learn how OCaml polymorphic variants let you add constructors without editing existing type definitions, illustrated with a JSON‑like parser that stays unchanged when a Boolean tag is added.
ocaml