Function features_of 

pub(crate) fn features_of(
    card: &Card,
    trusted: &[String],
    internal_date: Option<i64>,
    own: Option<AuthResults>,
    lexicon: &Lexicon,
) -> (Vec<String>, [f32; 35])

A card’s words and header features; own, Sioul’s checks kept apart from it (a corpus record’s), else those its headers carry (Sioul’s stamp first, your provider’s second: features::auth_results); its words read with lexicon.