Hi,

I am designing APIs that need to support both reference (class/object) and 
value types. I am running into restrictions of `mutating` keyword in my 
protocols and this is causing a lot of duplication of code. In order to 
understand what I mean please take a look at this gist 
<http://gist.github.com/hooman/2b74d9756976a43330c1acfcfba699f3>. 

As you see, I have pairs of almost identical declarations: KeyValueStore vs 
KeyValueStoreObject, and AnyDictionaryStore vs AnyDictionaryStoreObject. This 
keeps rapidly growing as I am designing my APIs. Is there any sane way around 
this?

Thank you for your time,
Hooman
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