Function effective_principal_scoped 

pub fn effective_principal_scoped(
    actor: u64,
    dependent: u64,
    authorized_domains: &[u64],
    requested_domain: u64,
) -> u64

Domain-scoped effective principal: a guardian’s act carries the dependent’s weight ONLY within a delegated domain; outside the delegated set the guardian cannot bind the dependent (the act falls back to the actor’s own weight).