docs: function read_wrapped_delimited_list(lexer, start, end, initial, separatorRE) {
  
    var list = read_delimited_list(lexer, start, end, initial, separatorRE);
    if(list.length === 1) // DEL? &&
  // DEL?    (sl.isList(list[0]) || sl.typeOf(list[0]) === 'boolean'))
    {
        // there's an extra nesting level than needed:
        list = list[0];
    }
    return list;
  }