remAddr# implementation does not match documentation

Csaba Hruska notes on ghc-devs that the documentation of remAddr# claims:

Return the remainder when the {\tt Addr\#} arg, treated like an {\tt Int\#},          is divided by the {\tt Int\#} arg.}

However, the documentation uses the unsigned mo_wordURem MachOp. I believe the documentation here is incorrect: I generally think of pointers as unsigned things and many arithmetic uses (e.g. GHC.Ptr.alignPtr) would break given a signed remainder for high addresses.