> i'm kind of puzzled beause i thought that 8r was as frozen as can be (i 
> must admit that i never use that encoding explicitly);

There have been several changes to 8r.enc in the past. Walter took
over the maintenance (the file is now part of psnfss) at a time where
different versions have been floating around.

Have a look at
  CTAN:macros/latex/required/psnfss/changes.txt

> doesn't such a change also relate to the presense of glyphs in the pfb's?

Yes and I think that this is the main reason for the changes. E.g. many
fonts (including the urw35) now have the Euro, so it was added.

Thomas

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