Trying to do something different today. Hunting bugs.
Addressing an issue in `ALTER SEQUENCE` commands [1], by adding a missing lock when calling RelationSetNewRelfilenumber and being more accurate about the type of lock required in that function's doc-comment. The change is sound, even if it is not the complete fix yet. 1. https://www.postgresql.org/message-id/19687-dd094472b0c48afb%40postgresql.org
v1-0001-FIX-missing-lock-in-AlterSequence.patch
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