Joel C. Salomon wrote:
> %\setlength{\intersentencespace}{\issp plus \isst minus \issh}
<snip>
> How can I set a rubber length the way I’m trying to?
Answered on comp.text.tex: Coerce the <skip> values to <dimen> values,
i.e.:
\setlength{\intersentencespace}{1\issp plus 1\isst minus 1\issh}
or use scratch <dimen> registers.
—Joel Salomon