include sig ... endval hash_fold_t : Base.Hash.state ‑> t ‑> Base.Hash.stateval hash : t ‑> Base.Hash.hash_valueval sexp_of_t : t ‑> Sexplib.Sexp.tval of_string : string ‑> tval length : t ‑> intmodule Expert : sig ... endEven though the underlying type includes an option, most users should not have to
think about the difference between Some "" and None. You can use the Expert
module to deal with the optionality, if need be.
module Stable : sig ... end