write_tlv_fields!(writer, {
(0, self.options.forwarding_fee_proportional_millionths, required),
(1, self.options.max_dust_htlc_exposure_msat, (default_value, 5_000_000)),
write_tlv_fields!(writer, {
(0, self.options.forwarding_fee_proportional_millionths, required),
(1, self.options.max_dust_htlc_exposure_msat, (default_value, 5_000_000)),