Commit 0ac5ad5134 ("Improve concurrency of foreign key locking") added infobits_set fields to certain WAL records. However, in the case of xl_heap_lock, it made the data type int8 rather than uint8.
I believe that this was a minor oversight. Attached patch fixes the issue. -- Peter Geoghegan
v1-0001-Fix-xl_heap_lock.infobits_set-type.patch
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