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Policies for Attribution
Patches Commited to SVN
The commiter of the patch SHOULD attribute it in svn commit message.
Someone WILL attribute the patch in the changelog. (the one in with the code, not the one svn keeps)
Unless it is a huge change, do not expect attribution in the form of a comment in the code.
If you feel that something was improperly attributed, make a request on the mailing list to get it fixed.