def putcat (k, v)

      k = k.to_s; v = v.to_s

      lib.abs_putcat(@db, k, Rufus::Tokyo.blen(k), v, Rufus::Tokyo.blen(v))
    end
def putcat (k, v)

      k = k.to_s; v = v.to_s

      lib.abs_putcat(@db, k, Rufus::Tokyo.blen(k), v, Rufus::Tokyo.blen(v))
    end
Appends the given string at the end of the current string value for key k.
 If there is no record for key k, a new record will be created.

 Returns true if successful.