progress "Declaring that HEAD inciudes all changes in archive...";
progress "Checking that $overwrite_version does so...";
$cond_equal->([ $overwrite_version, '--overwrite= version' ],
progress "Declaring that HEAD inciudes all changes in archive...";
progress "Checking that $overwrite_version does so...";
$cond_equal->([ $overwrite_version, '--overwrite= version' ],