[CM] How to make new applicable objects that use generic set/get?

[Iain Duncan]

Hi S7 Schemers, I'm hoping someone can help out, or point me at some
beginner friendly resources as I'm not able to figure this out from the
S7.html page. I am making a state management container for my max apps. I'd
like to make it follow the generic applicable syntax so that one can call
it as if it's a hashtable, allowing code using this to be unaware of
implementation. So I want to implement a setter and getter for my function
to be able to do:

;; call my setter
(set! (my-state-thing :foobar) 99)

;; call my setter
(my-state-thing :foobar)

I apologize if this is just basic scheme ignorance!
thanks
iain
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