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On AIX, doubles are aligned at 4 bytes, but int64 is aligned at 8 bytes. Our code assumes that doubles have alignment that can also be applied to int64, but that fails in this case. One effect is that heap_form_tuple() writes tuples in a different layout than Form_pg_sequence expects. Rather than rewrite the whole alignment code, work around the issue by reordering the columns in pg_sequence so that the first int64 column naturally comes out at an 8-byte boundary.