getSelectedRows broken when using ENTITY_BINDING with primitive entities

[StrangelyTyped]

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When using the grid with an array of primitives (as in the top example here: http://ui-grid.info/docs/#!/tutorial/323_more_binding) getSelectedRows no functions correctly returning no rows.
This can be seen in the following demonstration plunk: https://plnkr.co/edit/peULRxkeZy0QtYbE5rga?p=info where the selected items list is empty when any of the string items are selected, though works fine for the non-primitives.

The breaking change appears to be here: 0e83225 as primitive types such as strings cannot have properties such as $$hashkey and will not retain them if they are set.