code: function(list, start, end) {
              if (list && isArray(list.value)) {
                  start = evalIndex(list, start, 1);
                  end   = evalIndex(list, end, 0);
  
                  // see docs/impl-notes.md#slice-1
                  return newLessList(list.value
                      .slice(start, end), list.type);
              }
          }
docs: ....................................................