CREATE OR REPLACE FUNCTION jsonb_scalar_cat(data jsonb) RETURNS jsonb LANGUAGE plv8 AS
$$ plv8.elog(NOTICE, 'arg = ' + JSON.stringify(data));  return data; $$;
SELECT jsonb_scalar_cat(to_jsonb('asd'::TEXT));
NOTICE:  arg = "asd"
 jsonb_scalar_cat 
------------------
 "asd"
(1 row)

SELECT jsonb_scalar_cat(to_jsonb(19450509::INT));
NOTICE:  arg = 19450509
 jsonb_scalar_cat 
------------------
 19450509
(1 row)

SELECT jsonb_scalar_cat(to_jsonb(false::BOOL));
NOTICE:  arg = false
 jsonb_scalar_cat 
------------------
 false
(1 row)

SELECT jsonb_scalar_cat('{"key":[null, true, false, 19450509, "string"]}'::JSONB);
NOTICE:  arg = {"key":[null,true,false,19450509,"string"]}
                 jsonb_scalar_cat                 
--------------------------------------------------
 {"key": [null, true, false, 19450509, "string"]}
(1 row)

SELECT jsonb_scalar_cat('{"key":true}'::JSONB);
NOTICE:  arg = {"key":true}
 jsonb_scalar_cat 
------------------
 {"key": true}
(1 row)

SELECT jsonb_scalar_cat('{"key":"true"}'::JSONB);
NOTICE:  arg = {"key":"true"}
 jsonb_scalar_cat 
------------------
 {"key": "true"}
(1 row)

SELECT jsonb_scalar_cat('{"key":19450509}'::JSONB);
NOTICE:  arg = {"key":19450509}
 jsonb_scalar_cat  
-------------------
 {"key": 19450509}
(1 row)

SELECT jsonb_scalar_cat('{"key":null}'::JSONB);
NOTICE:  arg = {"key":null}
 jsonb_scalar_cat 
------------------
 {"key": null}
(1 row)

--SELECT jsonb_scalar_cat('null'::TEXT::JSONB);