You are right, but I have written my comment exactly for making those users aware of this problem. I consider this a very serious problem, because most naive u

You are right, but I have written my comment exactly for making those users aware of this problem. I consider this a very serious problem, because most naive users will assume automatically that when they give a file copy command they obtain a perfect duplicate of the original file. It is surprising for them to discover that this is frequently not true.