Hi,

I'm struggling a little with the global app state in Om. When decomposing big 
components I find myself wanting to use a cursor around component local state 
to pass to children in order to get 2-way-binding between parent and child 
component but without exposing this information to the global app state. It 
appears that this is not possible (actually I managed to get it to work 
somewhat by creating a MapCursor manually but this is clearly a hack since it 
throws errors about atom not implementing INotify or something like that).

As a concrete example, I want to build a form component for editing persons. 
This form component takes a person object (cursor) and handles properties 
common to all persons like name, age, whatever. Then I create components for 
the specific properties of different kinds of persons (maybe student and 
professor like in the Om example). Those components also get the person object 
(cursor) and just handle editing of the specific properties they know about.

This is of course possible with current Om, but as far as I can tell only if 
the person object lives in the global app state. This may be alright for 
editing but for creating I feel that this temporary state shouldn't have to be 
exposed through the global app state. And even for editing you still may not 
want to modify the object in the global state but a local copy.

Maybe I'm wrong and what I want to do is possible, or maybe I'm just thinking 
about this the wrong way in the first place. I would appreciate any advice.

thanks
Stefan

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