%%% Skip assignments
Consider the code:
\beginverbatim
\newskip\A
\newskip\B
\A = 3pt plus 1pt minus 1pt
\B = 1\A
\endverbatim
Is now the skip \type{\B} equal to \type{\A}?
No, it's not:
\beginverbatim
\the\A % 3pt plus 1pt minus 1pt
\the\B % 3pt
\endverbatim
In an assignment of the form
\beginverbatim
skip = skip
\endverbatim
\TeX\ ignores that part of a glue which deals with shrinkability and
stretchability. To avoid this effect one should not use a number/factor
(digit 1 in this case) at the right hand side of the equation. When necessary, one
should use the \type{\advance}, \type{\divide}, \type{\multiply} primitives
instead, since all they preserve the glue-specific part.
\endinput