> I do not like this sort of behavior in my dynamic type system.

Why? [Other than for performance reasons]

I keep repeating this point in every Tcl thread. Tcl was meant to be used to enable command line shells for programs written in C.

Btw, being able to treat a list as a dict has been useful to me. I (developer) write a routine to be used by a non-developer, who may not be a great programmer. The list notation is easy in Tcl. I can just tell them to make a list with keys and values alternating. And for a one-time conversion cost, I get to use it as a dict.

Also works the other way around: I can return a dict. And if a Blub user is processing it, he's free to ignore my documentation that it's a dict and process it as a list (again for a one-time cost).

YMMV.