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