# File lib/net/ldap/core_ext/array.rb, line 24
        def to_ber_oid
          ary = self.dup
          first = ary.shift
          raise Net::BER::BerError.new( "invalid OID" ) unless [0,1,2].include?(first)
          first = first * 40 + ary.shift
          ary.unshift first
          oid = ary.pack("w*")
          [6, oid.length].pack("CC") + oid
        end