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de429752d1
It now uses a facade pattern similar to `InvokeNode`: the range of the class is defined by an abstract class `DataFlow::SourceNode::Range`, while the actual behaviour is defined by the (no longer abstract) `SourceNode` class itself. Clients that want to add new source nodes need to extend `DataFlow::SourceNode::Range`, those that want to refine the behaviour of existing source nodes should extend `DataFlow::SourceNode` itself. While this is technically a breaking API change, I think separating the two aspects in this way is cleaner and makes it easier to use, and improves performance as well.