The main question is what you try to isolate from what? There are different ways to build isolations, in some PL you can restrict access to inside of the module, ot you can use closures to hide some data, or something like wrapper object which takes callback-functions (like monad).
I'm not sure I fully understand your initial question.
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Maybe to some extent.
The main question is what you try to isolate from what? There are different ways to build isolations, in some PL you can restrict access to inside of the module, ot you can use closures to hide some data, or something like wrapper object which takes callback-functions (like monad).
I'm not sure I fully understand your initial question.