Specifies the origin of the result or error.
Results from readOld or writeOld will be 'old'. Results from readNew or writeNew will be 'new'.
readOld
writeOld
readNew
writeNew
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Specifies the origin of the result or error.
Results from
readOldorwriteOldwill be 'old'. Results fromreadNeworwriteNewwill be 'new'.