# Filter: reject continuous sequences of duplicates
	#
	# Important: rely on `==`.
	#
	#     assert [1,2,1,1,1,3,2].iterator.seq_uniq.to_a	     ==  [1,2,1,3,2]
	fun seq_uniq: Iterator[E]
	do
		return new PipeSeqUniq[E](self)
	end