Function effective_principal 

pub fn effective_principal(
    actor: u64,
    dependent: u64,
    has_guardianship: bool,
) -> u64

Guardianship / delegation: when a guardianship relation holds, a guardian’s act carries the dependent’s legal weight (values:actsOnBehalfOf). Returns the identity whose weight the act bears — the dependent under guardianship, else the actor themselves.