///
/// Returns [`SendError::UnresolvedIntroductionNode`] if:
/// - `destination` contains a blinded path with an [`IntroductionNode::DirectedShortChannelId`],
///
/// Returns [`SendError::UnresolvedIntroductionNode`] if:
/// - `destination` contains a blinded path with an [`IntroductionNode::DirectedShortChannelId`],