diff --git a/libraries/liblmdb/midl.c b/libraries/liblmdb/midl.c
index 57f1e04..d2617c6 100644
--- a/libraries/liblmdb/midl.c
+++ b/libraries/liblmdb/midl.c
@@ -71,17 +71,6 @@ int mdb_midl_insert( MDB_IDL ids, MDB_ID id )
 {
 	unsigned x, i;
 
-	if (MDB_IDL_IS_RANGE( ids )) {
-		/* if already in range, treat as a dup */
-		if (id >= MDB_IDL_RANGE_FIRST(ids) && id <= MDB_IDL_RANGE_LAST(ids))
-			return -1;
-		if (id < MDB_IDL_RANGE_FIRST(ids))
-			ids[1] = id;
-		else if (id > MDB_IDL_RANGE_LAST(ids))
-			ids[2] = id;
-		return 0;
-	}
-
 	x = mdb_midl_search( ids, id );
 	assert( x > 0 );
 
@@ -97,15 +86,9 @@ int mdb_midl_insert( MDB_IDL ids, MDB_ID id )
 	}
 
 	if ( ++ids[0] >= MDB_IDL_DB_MAX ) {
-		if( id < ids[1] ) {
-			ids[1] = id;
-			ids[2] = ids[ids[0]-1];
-		} else if ( ids[ids[0]-1] < id ) {
-			ids[2] = id;
-		} else {
-			ids[2] = ids[ids[0]-1];
-		}
-		ids[0] = MDB_NOID;
+		/* no room */
+		--ids[0];
+		return -2;
 	
 	} else {
 		/* insert id */
diff --git a/libraries/liblmdb/midl.h b/libraries/liblmdb/midl.h
index 792e6ab..019d928 100644
--- a/libraries/liblmdb/midl.h
+++ b/libraries/liblmdb/midl.h
@@ -52,64 +52,27 @@ typedef size_t MDB_ID;
 	 */
 typedef MDB_ID *MDB_IDL;
 
-#define	MDB_NOID	(~(MDB_ID)0)
-
 /* IDL sizes - likely should be even bigger
  *   limiting factors: sizeof(ID), thread stack size
  */
 #define	MDB_IDL_LOGN	16	/* DB_SIZE is 2^16, UM_SIZE is 2^17 */
 #define MDB_IDL_DB_SIZE		(1<<MDB_IDL_LOGN)
 #define MDB_IDL_UM_SIZE		(1<<(MDB_IDL_LOGN+1))
-#define MDB_IDL_UM_SIZEOF	(MDB_IDL_UM_SIZE * sizeof(MDB_ID))
 
 #define MDB_IDL_DB_MAX		(MDB_IDL_DB_SIZE-1)
-
 #define MDB_IDL_UM_MAX		(MDB_IDL_UM_SIZE-1)
 
-#define MDB_IDL_IS_RANGE(ids)	((ids)[0] == MDB_NOID)
-#define MDB_IDL_RANGE_SIZE		(3)
-#define MDB_IDL_RANGE_SIZEOF	(MDB_IDL_RANGE_SIZE * sizeof(MDB_ID))
-#define MDB_IDL_SIZEOF(ids)		((MDB_IDL_IS_RANGE(ids) \
-	? MDB_IDL_RANGE_SIZE : ((ids)[0]+1)) * sizeof(MDB_ID))
-
-#define MDB_IDL_RANGE_FIRST(ids)	((ids)[1])
-#define MDB_IDL_RANGE_LAST(ids)		((ids)[2])
-
-#define MDB_IDL_RANGE( ids, f, l ) \
-	do { \
-		(ids)[0] = MDB_NOID; \
-		(ids)[1] = (f);  \
-		(ids)[2] = (l);  \
-	} while(0)
-
-#define MDB_IDL_ZERO(ids) \
-	do { \
-		(ids)[0] = 0; \
-		(ids)[1] = 0; \
-		(ids)[2] = 0; \
-	} while(0)
-
+#define MDB_IDL_SIZEOF(ids)		(((ids)[0]+1) * sizeof(MDB_ID))
 #define MDB_IDL_IS_ZERO(ids) ( (ids)[0] == 0 )
-#define MDB_IDL_IS_ALL( range, ids ) ( (ids)[0] == MDB_NOID \
-	&& (ids)[1] <= (range)[1] && (range)[2] <= (ids)[2] )
-
 #define MDB_IDL_CPY( dst, src ) (memcpy( dst, src, MDB_IDL_SIZEOF( src ) ))
-
-#define MDB_IDL_ID( bdb, ids, id ) MDB_IDL_RANGE( ids, id, ((bdb)->bi_lastid) )
-#define MDB_IDL_ALL( bdb, ids ) MDB_IDL_RANGE( ids, 1, ((bdb)->bi_lastid) )
-
 #define MDB_IDL_FIRST( ids )	( (ids)[1] )
-#define MDB_IDL_LAST( ids )		( MDB_IDL_IS_RANGE(ids) \
-	? (ids)[2] : (ids)[(ids)[0]] )
-
-#define MDB_IDL_N( ids )		( MDB_IDL_IS_RANGE(ids) \
-	? ((ids)[2]-(ids)[1])+1 : (ids)[0] )
+#define MDB_IDL_LAST( ids )		( (ids)[(ids)[0]] )
 
 #if 0	/* superseded by append/sort */
 	/** Insert an ID into an IDL.
 	 * @param[in,out] ids	The IDL to insert into.
 	 * @param[in] id	The ID to insert.
-	 * @return	0 on success, -1 if the ID was already present in the IDL.
+	 * @return	0 on success, -1 if ID was already present, -2 on error.
 	 */
 int mdb_midl_insert( MDB_IDL ids, MDB_ID id );
 #endif