GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it
\begin{theindex} \item \textsf{PolymakeInterface}, \hyperpage{3} \indexspace \item \texttt {POL}\discretionary {-}{}{}\texttt {Y}\discretionary {-}{}{}\texttt {M}\discretionary {-}{}{}\texttt {A}\discretionary {-}{}{}\texttt {K}\discretionary {-}{}{}\texttt {E{\textunderscore }}\discretionary {-}{}{}\texttt {C}\discretionary {-}{}{}\texttt {R}\discretionary {-}{}{}\texttt {E}\discretionary {-}{}{}\texttt {A}\discretionary {-}{}{}\texttt {T}\discretionary {-}{}{}\texttt {E{\textunderscore }}\discretionary {-}{}{}\texttt {T}\discretionary {-}{}{}\texttt {I}\discretionary {-}{}{}\texttt {K}\discretionary {-}{}{}\texttt {Z{\textunderscore }}\discretionary {-}{}{}\texttt {FILE} \subitem for IsExternalPolymakeObject, IsString, \hyperpage{5} \subitem for IsExternalPolymakeObject, IsString, IsList, \hyperpage{6} \item \texttt {POL}\discretionary {-}{}{}\texttt {Y}\discretionary {-}{}{}\texttt {M}\discretionary {-}{}{}\texttt {A}\discretionary {-}{}{}\texttt {K}\discretionary {-}{}{}\texttt {E{\textunderscore }}\discretionary {-}{}{}\texttt {S}\discretionary {-}{}{}\texttt {K}\discretionary {-}{}{}\texttt {E}\discretionary {-}{}{}\texttt {T}\discretionary {-}{}{}\texttt {C}\discretionary {-}{}{}\texttt {H{\textunderscore }}\discretionary {-}{}{}\texttt {W}\discretionary {-}{}{}\texttt {I}\discretionary {-}{}{}\texttt {T}\discretionary {-}{}{}\texttt {H{\textunderscore }}\discretionary {-}{}{}\texttt {O}\discretionary {-}{}{}\texttt {P}\discretionary {-}{}{}\texttt {T}\discretionary {-}{}{}\texttt {IONS} \subitem for IsExternalPolymakeObject, IsList, \hyperpage{5} \subitem for IsExternalPolymakeObject, IsString, IsList, \hyperpage{5} \end{theindex}