__HEADER__(Write LaTeX counters to auxiliary file)

\RequirePackage{etoolbox}

\newwrite__PACKAGE_MACRO__(out)
\immediate\openout__PACKAGE_MACRO__(out)\jobname.cnt\relax
\AtBeginDocument{
    \let__PACKAGE_MACRO__(saved@stepcounter)\stepcounter
    \def\stepcounter#1{
        __PACKAGE_MACRO__(saved@stepcounter){#1}
    \immediate\write__PACKAGE_MACRO__(out){#1: \csname the#1\endcsname}}
}