# Module Unique_id_intf

    module Unique_id_intf: sig .. end

Signature for use by `module : Unique_id`.

Signature for use by `module : Unique_id`.

    module type Id = sig .. end

Signature for use by `module : Unique_id`.
The sexps and strings look like integers.
CAVEAT: Values created with of_float, of_sexp, or of_string may be equal to previously created values.
Always returns a value that is not equal to any other value created with `create`.