- `MC = metaclass (OBJ)`
- `MC = metaclass (CLASSNAME)`

Return meta-information describing the class of `OBJ` or the class named by
`CLASSNAME`.

The returned value describes class attributes, properties, methods, events,
enumerations, and inheritance relationships when that information is available.

See also: `properties`, `methods`, `events`, `superclasses`.

### References

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