fix: allow usage of double quotes within json bodies

[darora]

A valid json object that includes a double quote escaped within a string causes an error.

Not sure if this is the best way to fix this!

postgres=# select json_build_object('foo', 'b"ar')::text;
 json_build_object
-------------------
 {"foo" : "b\"ar"}
(1 row)

postgres=# select json_build_object('foo', 'b"ar')::text::bytea;
ERROR:  invalid input syntax for type bytea

postgres=# select convert_to(json_build_object('foo', 'b"ar')::text, 'UTF8');
              convert_to
--------------------------------------
 \x7b22666f6f22203a2022625c226172227d
(1 row)

[soedirgo]

Thanks @darora! The problem is text::bytea is expecting escape format for textual repr of bytea. You can only escape either a backslash or an octet, so \" is invalid (and the fix is correct - should have used convert_to).

LGTM! Waiting for the others to chime in.