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Nested validation errors on update operations are currently broken.
ActiveRecord objects are compared for equality by id only. The |= operator would ignore any children which are only updated, i.e. whose id has not changed. By reversing the
target = target | [child]
logic totarget = [child] | target
, we elect to keep the child with its updated attributes. This is relevant for detecting validation errors in the child later.Let me know if you generally approve of this change, so I can start investing time into writing tests for it.