<p>Ah, I missed this comment in lmdb.h (and the order of mdb_txn_commit() and mdb_cursor_close() are incorrectly reversed in lmdb_dbiCursorFree())</p>
<pre><code>        /** @brief Close a cursor handle.
         *
         * The cursor handle will be freed and must not be used again after this call.
         * Its transaction must still be live if it is a write-transaction.
         * @param[in] cursor A cursor handle returned by #mdb_cursor_open()
         */
</code></pre>
<p>I will fix when I rip out the debugging instrumentation in lmdb.c ...</p>

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