Function lmdb_sys::mdb_env_get_maxkeysize
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@brief Get the maximum size of keys and #MDB_DUPSORT data we can write.
Depends on the compile-time constant #MDB_MAXKEYSIZE. Default 511. See @ref MDB_val. @param[in] env An environment handle returned by #mdb_env_create() @return The maximum size of a key we can write