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Didier Verna <verna@inf.enst.fr> writes:

> Shaun Lipscombe <shaun.lipscombe@gasops.co.uk> writes:
> 
> 
> > What I don't understand though, is why have 3 different values t 'head
> > and 'last.  I understand that 'head works on the headers, so what use
> > would t, and 'last have?
> 
> Because Lars wants uniform specifications over all gnus-treat-*
> variables.

The worst thing is that the docstrings are highly misleading.  All of
them say "Valid values are nil, t, `head', `last', an integer or a
predicate."

Although those values may be technically "valid", in the case
gnus-treat-date-lapsed, only nil and `head' are really meaningful.
The docstring should be helpful about what is really going on rather
than confuse matters for the user.

The manual is apparently even worse -- it just lists the variables and 
explains what the "predicate" stuff does.