Function assign_preset_verdict 

pub fn assign_preset_verdict<'g>(
    actor: &Authority<'g>,
    workspace: &str,
    set: &str,
    cx: &Context<'_>,
) -> Verdict<'g>

The verdict on actor assigning the saved grant set set in workspace: a grant on the set’s assign node allows that set alone, and otherwise the workspace’s grant action decides for every set, since assigning a set is granting what it holds.