unsafeWithPrimLen (MVector n fp ) fun =  withForeignPtrPrim fp (\x -> fun (x,n))
unsafeWithPrimLen (MVector n fp ) fun =  withForeignPtrPrim fp (\x -> fun (x,n))
unsafeWithPrimLen (MVector n fp ) fun =  withForeignPtrPrim fp (\x -> fun (x,n))