DeltaAware merge(DeltaAware d)
DeltaAwareinstance, and return a coherent and complete
DeltaAwareinstance. Implementations should be able to deal with null values passed in, or values of a different type from the expected DeltaAware instance. Usually the approach would be to ignore what is passed in, create a new instance of the DeltaAware implementation that the current Delta implementation is written for, apply changes and pass it back.
d- instance to merge with, or null if no merging is needed
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