Value.t is the OCaml type corresponding to Emacs's universal type of values. It is
represented as an OCaml custom block (emacs_value_ops in ecaml_stubs.c) wrapped
around the emacs_value pointer type defined by the Emacs native-code module
interface, emacs-module.h, available in Emacs 25 and beyond. This module has
low-level functions for working with Emacs values, OCaml wrappers that call the C
functions specified in emacs-module.h. All other calls from OCaml to Emacs are
built on top of this module.
include sig ... endval sexp_of_t : t ‑> Sexplib.Sexp.tval intern : string ‑> tval nil : tval is_not_nil : t ‑> boolval is_symbol : t ‑> boolval of_int : int ‑> tval to_int : t ‑> intval of_float : float ‑> tval to_float : t ‑> floatval of_string : string ‑> tval to_string : t ‑> stringval vec_size : t ‑> int