size of .svn/pristine directory (svn 1.7.x)

I noticed that the size of the .svn/pristine directory can get huge
over time (several times the expected size). A "svn cleanup" solves
the problem, but
1. this isn't documented (I'm wondering how many users know that);
2. this isn't automatic.

About (2), svn could warn the user when a cleanup could be needed.
I don't know what is the best solution.

I've reported a bug on the Debian BTS about that:

  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=731769

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Vincent Lefèvre <vincent@vinc17.net> - Web: <http://www.vinc17.net/>
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Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)