You mean, changing
Copyright (C) 1999, 2000, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
Free Software Foundation, Inc.
to
Copyright (C) 1999-2009 Free Software Foundation, Inc.
?
It's allowed by current FSF rules, but the fact that the FSF did
not want it for 15 years does not give me a comfortable
feeling. Rather, I fear that, with a small percentage probability,
the rule may change again, in the opposite direction. So I would
prefer to wait for 1 or 2 more years before doing that.
Since when is this "allowed"? The GNU maintainer guide say explicitly
that it isn't:
| Do not abbreviate the year list using a range; for instance, do not
| write @samp{1996--1998}; instead, write @samp{1996, 1997, 1998}.
