set enable_seqscan=off;
CREATE TABLE test_varbit (
	i varbit
);
INSERT INTO test_varbit VALUES ('001'),('010'),('011'),('100'),('101'),('110');
CREATE INDEX idx_varbit ON test_varbit USING rum (i);
SELECT * FROM test_varbit WHERE i<'100'::varbit ORDER BY i;
  i  
-----
 001
 010
 011
(3 rows)

SELECT * FROM test_varbit WHERE i<='100'::varbit ORDER BY i;
  i  
-----
 001
 010
 011
 100
(4 rows)

SELECT * FROM test_varbit WHERE i='100'::varbit ORDER BY i;
  i  
-----
 100
(1 row)

SELECT * FROM test_varbit WHERE i>='100'::varbit ORDER BY i;
  i  
-----
 100
 101
 110
(3 rows)

SELECT * FROM test_varbit WHERE i>'100'::varbit ORDER BY i;
  i  
-----
 101
 110
(2 rows)