"Stephen J. Turnbull" <stephen(a)xemacs.org> writes:
 Michael Albinus writes:
  > It's about backward compatibility. If id_format is NIL one uses
  > call2, in order to run also file name handlers which are not aware
  > of the new parameter.
 Unfortunately, it can't provide backward compatibility.  The API is
 inherently incompatible, and the authors of file handlers have no
 control over the compatibility break.  (Especially considering that
 the new argument is probably used in many places in Emacs's core
 already!) 
IIRC, it was intended for a transition period, in order to not break
file name handlers immediately. But my memories might be wrong.
Nowadays, this is not needed anymore in GNU Emacs, I agree.
Best regards, Michael.
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