NR incorrect now?

[Phil Holmes]

The NR says "In accordance with standard typesetting rules, a natural sign 
is printed before a sharp or flat if a previous accidental on the same note 
needs to be canceled. To change this behavior, set the extraNatural property 
to f in the Staff context."

Following http://code.google.com/p/lilypond/issues/detail?id=1481 I believe 
this is no longer exact.  Anyone disagree?

--
Phil Holmes