I don't like complicating the man page with discussion of this. The man page concisely and correctly documents the actual behavior.
Varying the behavior based on whether the user is root seems to just be asking for trouble. It does not emulate tee either; a non-root user who can write to a file they don't own can tee to it and its owner will be preserved; tee simply opens the file and writes over it. -- see shy jo
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