Note: This pertinent question moved from a topic culled by curation.
(The topic was "should you be able to assign ~unset~ isotopes via SET-WORD! without getting an error, and the answer is obviously yes in light of new features...so the old conversation was just a jumble of outdated terminology which would confuse anyone finding it.)
On a tangential note: I'm not sure why PRINT returns a ~none~ isotope, and wonder if it wouldn't be better to have it be silent like ELIDE? Would that create havoc if new users did confuse its usage?