I would exit the 1950s at long last. As long as you have type information percolating up in the parser it is a piece of cake. I'd like to protect every one who hates it as a dangerous invasion on their data division. And I wanted to engage the original proponent of the various SET syntaxes both technically and in a manner that illustrates the need to isolate experimental syntax. The stuff is good.
Isolation is a project management concept and a technicians challenge.
Folks who step forth with creative ideas have energy. I, for one, want to channel that energy. If the standard is silent or actually says you can't stop them, then you can't. But I can imagine financial environemts in which it might be reasonable to flag or error out any such encodings. But we get ahead of ourselves.