// TODO: get rid of `tmp` and/or `buf`

            let mut tmp = Vec::new();

            let mut z = 0;

                tmp.resize(e.to.end - e.to.start, 0);

                let sz = e.to.end - e.to.start;
                buf.resize(z + sz, 0);

                    .get_contents_ext(e.to, &mut tmp)

                    .get_contents_ext(e.to, &mut buf[z..])

                buf.extend_from_slice(&tmp);

                z += sz;