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This commit reimplements filter for Streams, but does not reimplement
map in StreamWithFilter.
The problem is that GC can't collect instances of Streams residing on the stack if there are multiple references to the Stream (more than a single one on the stack on which a Stream method is invoked). In the case of a StreamWithFilter, being an inner class, there is always an `$outer` reference to the outer object, so there is little GC can do. Possible solution - change the return type of WithFilter to something else (in TraversableLike) to allow it to return objects that don't have to subclass TraversableLike.WithFilter, and reimplement the withFilter method in Stream to simply call `filter` method - in the case of Streams, `withFilter` has little sense in either case...
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