Re: frame-local variables weirdness

[Richard Stallman]

I don't think that Emacs has any way to cancel what
make-variable-frame-local does.  We never tried to implement one.
Likewise there is no way to cancel what make-variable-buffer-local
does.  I am not surprised that confusion happens if you try doing both
to the same variable, because they are conflicting states.

I don't think we should try to change this now.