is -kk important in hg convert ?

hg user mercurialuser at
Mon Mar 17 18:10:56 CDT 2008

In convert extension there is this line:
args = ("-N -P -kk -r %s --" % rev).split()

These are the arguments passed to the cvs server when a new revision is

-kk resets the $Id: <value>$ string to the empty $Id$.....

Now, when I diff a converted file from a cvs checked-out file.... the file
is different... is the  -kk actually necessary ?

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