On 23/09/2010 00:08, Morten Høgholm wrote:
> I know one could do this the way you have outlined. There are,
> however, a few gotcha (as always in TeX), which is why there have been
> different implementations. If you look back in time in the svn, you
> will also find that there was actually both "ands" and "ors" functions
> at one point.

[lots of careful analysis]

Morten makes a good case for the current approach: back to thinking for me!
Joseph Wright