message: Fix: Add missing `begin()` and `end()` member functions to `alt_string`
diff: @@ -102,6 +102,10 @@ class alt_string
  str_impl.resize(n, c);
  }
  + auto begin() -> std::string::iterator { return str_impl.begin(); }
  +
  + auto end() -> std::string::iterator { return str_impl.end(); }
  +
  template <typename op_type>
  bool operator<(const op_type& op) const
  {
  