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cd2ccee9d8
Fixed bug where :class:`.Load` objects were not pickleable due to mapper/relationship state in the internal context dictionary. These objects are now converted to picklable using similar techniques as that of other elements within the loader option system that have long been serializable. Fixes: #4823 Change-Id: Id2a0d8b640ac475c86d6416ad540671e66d410e5