def get4 (k)

      l = lib.tcbdbget4(as_btree, k, Rufus::Tokyo.blen(k))
      Rufus::Tokyo::List.new(l).release
    end
def get4 (k)

      l = lib.tcbdbget4(as_btree, k, Rufus::Tokyo.blen(k))
      Rufus::Tokyo::List.new(l).release
    end
This is a B+ Tree method only, returns all the values for a given
 key.