pub fn starts_from<'a>(&self, feature_id: impl Into<FeatureId<'a>>) -> Result<bool, Error> {
        Ok(self
            .params
            .has_initial(self.graph.feature_ix(feature_id.into())?))
    }
Returns true if the query starts from the given feature ID.

Returns an error if this feature ID is unknown.
guppy/src/graph/feature/query.rs