pub fn initial_packages<'a>(&'a self) -> impl Iterator<Item = PackageMetadata<'g>> + 'a {
        // feature ixs are stored in sorted order by package ix, so dedup() is fine.
        self.initials().map(|feature| feature.package()).dedup()
    }
Returns the list of initial packages specified in the query.

The order of packages is unspecified.
guppy/src/graph/feature/query.rs