const std::vector<ValueBase> strings((*strings_)(t).get_list());
const String before((*before_)(t).get(String()));
const String separator((*separator_)(t).get(String()));
const std::vector<ValueBase> strings((*strings_)(t).get_list());
const String before((*before_)(t).get(String()));
const String separator((*separator_)(t).get(String()));