message: Make sure to not compare signed with unsigned.
diff: @@ -22,7 +22,7 @@ static constexpr absl::string_view kEllipses = "...";
  std::ostream& operator<<(std::ostream& stream, const AutoTruncate& trunc) {
  const auto text = trunc.text;
  - const auto length = text.length();
  + const int length = text.length();
  if (length <= trunc.max_chars) return stream << text;
  const auto context_length = trunc.max_chars - kEllipses.length();
  const auto tail_length = context_length / 2;
  