Warning: The main program customization variables associated with arrays are not documented.
Customization variables for the main program associated with an array of values
are handled differently. You can use texinfo_add_to_option_list to
add values to the array and texinfo_remove_from_option_list to
remove values from the array associated with the customization variable:
$variable_name is the name of the variable; the values in the
array reference $variable_values_array_reference are added to the
list associated with the variable with texinfo_add_to_option_list, and removed with
texinfo_remove_from_option_list.
If the optional argument of texinfo_add_to_option_list $prepend
is set, the values are prepended instead of being appended.