Am Thu, 8 May 2014 13:51:34 +0100 schrieb David Carlisle:

> If anyone has some real biblatex  files and could confirm to me that 
> this doesn't break them I'd be grateful.

I tested a bit with various files and it seems ok. But -- as the
question on shows -- the bug didn't always lead to errors but
could simply produce faulty output and it is not so easy to check if
somewhere an "and" or a comma is missing.

If one loads the new xkeyval v2.6c before keyval the error is still
there. So xkeyval needs a patch too. 

Ulrike Fischer