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Such custom object types are able to send granular updates between server and client. For example if you change from Rhino one subproperty value (or for more complex element property types - such as 'component' type - if something changes in only one of the subproperties) then only the that change is sent over to the browser/client instead of the whole custom object (and the other way around - a subproperty change on client doesn't send the full object, just the change to server).

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