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TODO (ordered by priority)

• Import reliability of connector tool (port drag and drop).

• Make a tool subclass that allows easier debugging.

• Generalize Definitions and introduce BoxType. Param support can be encapsulated as ParamSpecs:

Definitions.add('holoviews', some_class)      # Automatically put into Box.
Definitions.add('holoviews', BoxType(some_class, 
       port_types={'foo': 'no-port', '     # From class attribute if not overridden
                   'bar': 'untyped_port',
                   'baz': 'rack-port'},    # For param.List
    buttons=[('Bang button', 'bang_method')]) # Buttons on the bottom.

• BoxType can instantiate to Box which can handle param validation/setting as well as buttons etc.
• Automatically turn ObjectSelector of strings into dropdowns.
• Other object selectors could work, but would need repr(obj)->obj. Maybe with:

# Like instance.set_params but with mapping.
# Maybe handles button calls?
graph.update_instance(instance, params)

• Use literal_eval for other parameters.
• Support time dependent number generators (propagate self).
• Batch updates both client and server side for better performance.
• When in add_link in python, put param setting in try/except and issue 'remove_link' command on except (i.e prevent invalid connections).
• Make it easier to connect when zoomed out.

Wishlist (unordered)

• Add 'display_params' to Nodes e.g 'display_free_parameters:true' and 'viewport:true'.
• Multiple output ports (maybe generalize propagate?)
• Allow demo_graph to be specified from Python.
• Implement DAG checking.
• Improve registration of interfaces.