Prevents chunks from travelling down the stream until the predicate returns true.
--0--1--2--3--4--5--6--1--2--3--4--after(x => x > 4)------------------5--6--1--2--3--4- Copy
--0--1--2--3--4--5--6--1--2--3--4--after(x => x > 4)------------------5--6--1--2--3--4-
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Prevents chunks from travelling down the stream until the predicate returns true.