Method has_hash

test-app/runtime/src/main/cpp/ada/ada.h:6746–6748

constexpr void url::clear_search() { query = std::nullopt; }

[[nodiscard]] constexpr bool url::has_hash() const noexcept {
  return hash.has_value();
}

[[nodiscard]] constexpr bool url::has_search() const noexcept {
  return query.has_value();