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gotcha. Calling `.filter` for a concrete class of a Collection (like ArrayList, HashMap, etc.) doesn't produce a lazy iterator but an intermediate collection of an appropriate type. Which means that simply by looking at `items.filter { .. }` you have no idea if it's lazy or not. Gotta check what `items` is.

In most languages I know such functions (along with `map` and other functional stuff) tend to produce lazy results which you can then reify if needed.

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