global vars and #:declarative? (was [critical bug] The set! doesn't work in indirect reference)

I realized the #:declarative? can only be applied in the downstream modules
of the module holding global vars.
So the #:declarative? will affect the whole module and I have to put it
everywhere that references the global vas.

Maybe it'd be better if there's finer granularity control for each, like
define-non-dclarative or else.

BTW. In my case, I want to implement the global var mutation. For such a
case, if users don't want to put #:declarative? to affect the whole
downstream modules, maybe the best way is to implement getter and setter
inside the global var module.

Comments are welcome.
Thanks!
Best regards.