- `superclasses (OBJ)`
- `superclasses (CLASSNAME)`
- `NAMES = superclasses (...)`

List the direct superclasses of the object `OBJ` or of the class named by
`CLASSNAME`.

When called with no output argument, display the superclass names. Otherwise,
return the names in a cell array of strings.

See also: `class`, `isa`, `metaclass`.

### References

- https://www.mathworks.com/help/matlab/ref/superclasses.html
- https://octave.sourceforge.io/octave/function/superclasses.html