pub fn is_final_excluded(&self, package_id: &PackageId) -> Result<bool, guppy::Error> {
        self.graph.metadata(package_id)?;
        Ok(self.final_excludes.contains(package_id))
    }
Returns true if a package ID is currently excluded from the final output.

Returns an error if this package ID isn't known to the underlying graph.
tools/hakari/src/hakari.rs