docs: function copySymbol(symbol, meaning) {
                  if (symbol.flags & meaning) {
                      var id = symbol.name;
                      // We will copy all symbol regardless of its reserved name because
                      // symbolsToArray will check whether the key is a reserved name and
                      // it will not copy symbol with reserved name to the array
                      if (!symbols[id]) {
                          symbols[id] = symbol;
                      }
                  }
              }