Type is the unique most specialised type of which Datum denotes an instance;

NB 3 is an instance of byte, char, short, int and long, of which byte and char are the joint, overlapping most specialised types, so this relates 3 to the pseudo subtype 'char_byte';

See also

- jpl_type_to_preferred_concrete_type/2 for converting inferred types to instantiable types