-- Testing cross-types compatibility
SELECT (0::int16)::numeric;
 numeric 
---------
       0
(1 row)

SELECT ('0'::numeric)::int16;
 int16 
-------
 0
(1 row)

SELECT ('170141183460469231731687303715884105728'::numeric)::int16;
ERROR:  int16 out of range
SELECT (0::int16)::json;
 json 
------
 0
(1 row)

SELECT json_build_object('some', 0::int16);
 json_build_object 
-------------------
 {"some" : 0}
(1 row)

SELECT ('0'::json)::int16;
 int16 
-------
 0
(1 row)

SELECT (0::int16)::jsonb;
 jsonb 
-------
 0
(1 row)

SELECT jsonb_build_object('some', 0::int16);
 jsonb_build_object 
--------------------
 {"some": 0}
(1 row)

SELECT ('0'::jsonb)::int16;
 int16 
-------
 0
(1 row)

SELECT ('"abc"'::jsonb)::int16;
ERROR:  cannot cast jsonb string to type int16