{"ast_node_type":"other","tokens":[{"end":64,"kind":"keyword","start":0,"text":"Some(Zeros(_chunk_domain_size))"}]}
            Some(Zeros(_chunk_domain_size)) => ChunkIter::Zeros,
        match self.chunks.get(chunk_index) {
            Some(Ones(chunk_domain_size)) => ChunkIter::Ones(0..*chunk_domain_size as usize),