Notification Dict Construction and Routing about traitlets HOT 2 CLOSED

@rmorshea _notify_trait is meant to disappear to the benefit of direct calls to notify_change. The only reason why it is still around is because ipywidgets overloads it (i.e. uses the private method). As soon as ipywidgets 5.0 is released and uses notify_change, we will remove the _notify_trait method for good.

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@SylvainCorlay The only reason I can see something like notify_trait being useful is if there were a generalized way of selecting the appropriate event handlers based on information given in the dict. Is that something worth considering for the future, or do you see a series of methods like notify_<type> being employed instead?

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