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Re: (ITS#8209) Broken MDB_CP_COMPACT threading
MDB_CP_COMPACT would drop a new, empty main DB.
(I.e. the main DB would lose its flags.)
Compacting can verify that the written metapage claims
enough DB pages. But not the opposite - it should not
fail if it claims too many pages since that would mean
we can't compact a DB which has suffered page leaks.
We could detect that and re-write the metas at the end,
if the user requests it and the file is seekable.