I thought the secret sauce for Rebol was that the syntax is so flexible that you can express things like email addresses etc. as seeming “literals”. I.e. you don’t have to wrap everything in strings (and enums and).
I thought the trick with Rebol is that it's "stringly-typed" like Tcl, so you can invent whatever syntax you want because it's all just strings anyway.
Yes, that’s the approach it takes — having an unusually large range of literal syntax. That’s different to what Perun2 seems to do, but it’s still ‘similar in spirit’ like I said.