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Pad volume behavior is different for new `transform()` API
This is documenting a change that occurred due to the changes in #1958. An example is below.
Before padding

Previous behavior after padding

New behavior after padding

As can be seen above, in the new behavior compared to the previous behavior, the data is shifted to the right. The previous behavior is a result of the extent on the vtkDataObject being explicitly modified.
If we want to restore the previous behavior, this is something that we can probably still do for an internal pipeline, but I am not sure if it would be possible in the external pipeline.