http://qs1969.pair.com?node_id=628007


in reply to 'base' versus @ISA, why?

Operationally, it's the same thing (minus fields). In human language terms, a declaration is purported to be clearer than messing with assignments.

⠤⠤ ⠙⠊⠕⠞⠁⠇⠑⠧⠊