set enable_seqscan=off;
CREATE TABLE test_numeric (
	i numeric
);
INSERT INTO test_numeric VALUES (-2),(-1),(0),(1),(2),(3);
CREATE INDEX idx_numeric ON test_numeric USING rum (i);
SELECT * FROM test_numeric WHERE i<'1'::numeric ORDER BY i;
 i  
----
 -2
 -1
  0
(3 rows)

SELECT * FROM test_numeric WHERE i<='1'::numeric ORDER BY i;
 i  
----
 -2
 -1
  0
  1
(4 rows)

SELECT * FROM test_numeric WHERE i='1'::numeric ORDER BY i;
 i 
---
 1
(1 row)

SELECT * FROM test_numeric WHERE i>='1'::numeric ORDER BY i;
 i 
---
 1
 2
 3
(3 rows)

SELECT * FROM test_numeric WHERE i>'1'::numeric ORDER BY i;
 i 
---
 2
 3
(2 rows)