`ForeignPtr` should be strict in `ForeignPtrContents`
ForeignPtr is defined as
data ForeignPtr a = ForeignPtr Addr# ForeignPtrContents data ForeignPtrContents = PlainForeignPtr !(IORef Finalizers) | MallocPtr (MutableByteArray# RealWorld) !(IORef Finalizers) | PlainPtr (MutableByteArray# RealWorld)
ForeignPtrContents is strict in all its fields, but
ForeignPtr is lazy in the
ForeignPtrContents. That should probably not be the case (or, if it should, we should document why).
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