private int extract_children(int idx) {
        int bytes = decode_meta(data[idx++]);
        return (bytes == 0)
                ? peek_cmpr_int(idx)
                : (bytes - 1);
    }
A read-only view of a Slime value that is stored in binary format.
vespajlib/src/main/java/com/yahoo/slime/BinaryView.java