This patch modifies the ReadStr function in pg_backup_archiver.c to validate
the result of *AH->ReadBufPtr matches the value of l.  The resulting error
is:

pg_restore: [archiver] expected 410 bytes, only got 275 bytes

Attachment: pg_restore.diff
Description: Binary data

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TIP 9: In versions below 8.0, the planner will ignore your desire to
       choose an index scan if your joining column's datatypes do not
       match

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