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When publishing the signal requires a `_pruning` attribute in order to check if the node is not currently getting removed. The attribute is implemented in `DOMNode` and not `MessagePump`.
Applies generics to the `SignalCallbackType`. Primarily to indicate what type is required, when subscribing.
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Updates the
Signalclass to use the generic type for callbacks. This allows type checker to know what the full type of the callable should be when subscribing.