checking if a list is empty

[Hans Georg Schaathun]

On Thu, 12 May 2011 17:44:07 +1200, Gregory Ewing
  <greg.ewing at canterbury.ac.nz> wrote:
:  Roy Smith wrote:
: > Hans Georg Schaathun <hg at schaathun.net> wrote:
: >>If both are numbers, they are converted to a common type. Otherwise, 
: >>objects of different types always compare unequal

Actually, I did not.
:-- hg