one 
-----
 1/1
(1 row)

 minus_one 
-----------
 -1/1
(1 row)

 undef 
-------
 0/0
(1 row)

 zero 
------
 0/1
(1 row)

 zero 
------
 0/1
(1 row)

 undef 
-------
 0/0
(1 row)

 half 
------
 1/2
(1 row)

 two_third 
-----------
 2/3
(1 row)

 undef 
-------
 0/0
(1 row)

 zero 
------
 0/1
(1 row)

 zero 
------
 0/1
(1 row)

 undef 
-------
 0/0
(1 row)

 minus_half 
------------
 -1/2
(1 row)

 minus_two_third 
-----------------
 -2/3
(1 row)

 half 
------
 1/2
(1 row)

 one 
-----
 1/1
(1 row)

 zero 
------
 0/1
(1 row)

 minus_one_err 
---------------
 0/0
(1 row)

 one 
-----
 1/1
(1 row)

 zero 
------
 0/1
(1 row)

 minus_one_err 
---------------
 3/1
(1 row)

 minus_three_err 
-----------------
 1/1
(1 row)

 one 
-----
 1/1
(1 row)

 one_fourth 
------------
 1/4
(1 row)

 minus_one_fourth 
------------------
 -1/4
(1 row)

 minus_one_fourth 
------------------
 -1/4
(1 row)

 one 
-----
 1/1
(1 row)

 minus_four_nineths 
--------------------
 -4/9
(1 row)

 minus_four_nineths 
--------------------
 -4/9
(1 row)

 false 
-------
 f
(1 row)

 false 
-------
 f
(1 row)

 true 
------
 t
(1 row)