`StablePtr` in `ST`

Matthew Farkas-Dyck <[email protected]>
Newsgroups gmane.comp.lang.haskell.ghc.devel,gmane.comp.lang.haskell.glasgow.user
Message-ID <CAL3m8eAtBW8Chf_ZBTE+QuOiga885D0gyu40RP8ixYEg7Mi=Fw@mail.gmail.com> 
I have been doing some work where i want `StablePtr`, but also to not
be confined to `IO`. I saw the following comment in
"compiler/prelude/PrimOp.hs":

Question: Why @RealWorld@ - won't any instance of @_ST@ do the job? [ADR]

It has been there for 20 years. What is the answer? If it is safe i'll
send the patch generalizing these operations.
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