message: serialization.Serializer: Factor serialization of `DurationOpt`.
diff: @@ -847,9 +847,7 @@ namespace elle
  void
  Serializer::serialize(std::string const& name, DurationOpt& opt)
  {
  - ELLE_LOG_COMPONENT("elle.serialization.Serializer");
  - ELLE_TRACE_SCOPE("%s: serialize option \"%s\"", *this, name);
  - Details::serialize_named_option<S>(*this, name, opt);
  + this->serialize<S>(name, static_cast<boost::optional<Duration>&>(opt));
  }
  // std::unique_ptr
  