bpy.data list node

Created by: Durman

Problem statement

I'm thinking of creating new node with list UI with elements of Blender data blocks like objects, materials, collections and cetera. There are already several nodes which use list UI like that - objects in and set assign material list nodes. It would be useful to generalize this idea in the separate node. The node won't have any inputs. The only node parameter should be type of data blocks collection from which to choose elements.

+-----------------+
|            data o
|                 |
| type of data ^  |
| --------------- |
| | item 1    - | |
| | item 2    - | |
| |      +      | |
| --------------- |
+-----------------+

Right now I'm not sure which behavior will be more convenient in case of changing type of data block when list of elements is not empty. It is possible to reset whole list, to mark elements with wrong type as invalid or do nothing.