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This is a part of copy-on-write sanitization, to avoid all the checks which were attempting to keep sub-data pointers intact. Point is: ID pointers never change for CoW datablocks, but nested data pointers might change when updating existing copy. Solution: Only bind ID data pointers and index of sub-data. This will make CoW datablock 7update function was easier in 2.8. In master we were only using pose channel pointers in callbacks, this is exactly what this commit addresses. A linear lookup array is created on pose evaluation init and is thrown away afterwards. One thing we might consider doing is to keep indexed array of poses, similar to chanhash. Reviewers: campbellbarton Reviewed By: campbellbarton Subscribers: dfelinto Differential Revision: https://developer.blender.org/D3124