Bryan O'Sullivan committed 94ee884 Merge

unstream: choose a winner - the continuation

For a simple benchmark filtering many very small strings, this
allocates 7.8% less memory and 2.4% less time than unstream in The difference slowly disappears for larger strings.

The "use a specialised pair" approach can't match the reduction in
memory use, and for reasons unknown to me, seems to be slower than
the code in

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