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Hallvard Furuseth authored
MDB_NOSUBDIR was == MDB_REVERSEKEY. That affected the freelist: Env flags are stored in mm_flags alias mm_dbs[FREE_DBI].md_flags. It stays a persistent flag, in case mdb_env_open someday wants to pick/verify which lockfile to use with the datafile. Catch bad flags so they will no longer make it into the data file.
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