unsafeFreeze (MUArray start len (MUArrayAddr fptr)) =
    pure $ UArray start len (UArrayAddr fptr)
unsafeFreeze (MUArray start len (MUArrayAddr fptr)) =
    pure $ UArray start len (UArrayAddr fptr)
unsafeFreeze (MUArray start len (MUArrayAddr fptr)) =
    pure $ UArray start len (UArrayAddr fptr)