docs: function confChanged(current, proposed) {
      if (stringify(current.conf) !== stringify(proposed.conf)) {
          if (current.version >= proposed.version) {
              const e = new Error('Schema change, but no version increment.');
              e.current = current;
              e.proposed = proposed;
              throw e;
          }
          return true;
      } else {
          return false;
      }
  }