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Its because T and C are bounded to `Any`, and `Unit` is an instance of `Any`. `Unit` isn’t quite the same as Java’s `void`, it actually is an object, so the implicitly returned `Unit` object can also be cast to `Any`. You’ll need to set up some kind of base class or interface that your predicate requires other than `Any`. Also, the naming might be a bit confusing, as a “predicate” is usually a function which returns a `Boolean`