fn channel_penalty_msat(&self, short_channel_id: u64, source: &NodeId, target: &NodeId) -> u64;
/// Handles updating channel penalties after failing to route through a channel.
fn channel_penalty_msat(&self, short_channel_id: u64, source: &NodeId, target: &NodeId) -> u64;
/// Handles updating channel penalties after failing to route through a channel.