50g System RPL list processing

[Marcus von Cube]

(10-29-2014 12:20 PM)Claudio L. Wrote:  returning NULL is about the same as an error (the user has to catch it or prevent this condition or their code will likely fail), except the concept of NULL is not defined in RPL (perhaps should be nil like in LISP?) so it would feel like a weird quirk of just one set of functions, rather than a feature of the language (like nil is in LISP).

Why not define two generic objects nil and unit which behave properly when used in further calculations, i. e. like zero and one when combined with numbers, like an empty string and and error when combined with strings, and so forth?