fn find_route(
&self, payer: &PublicKey, params: &RouteParameters, _payment_hash: &PaymentHash,
first_hops: Option<&[&ChannelDetails]>, scorer: &S
fn find_route(
&self, payer: &PublicKey, params: &RouteParameters, _payment_hash: &PaymentHash,
first_hops: Option<&[&ChannelDetails]>, scorer: &S