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(Get the code!)
The important bit here is the version where the table was originally created, rather than just the source server version. The table might be created a long time ago with a pre-5.1.7 version, in which case some fields in the data files might be left uninitialized even after an upgrade to 5.5. InnoDB will ignore those values (and updates to correct ones when updating the corresponding pages), but the improved import procedure relies on those values to scan and update index pages.