Whether data a reader is given can be read: error when its writer's
version is outside the range the reader reads, warning when it is in the
range but newer than the version the reader knows of (the data may hold
what the reader does not know and leaves out). Both null when it reads.
Whether data a reader is given can be read:
errorwhen its writer's version is outside the range the reader reads,warningwhen it is in the range but newer than the version the reader knows of (the data may hold what the reader does not know and leaves out). Both null when it reads.