"JSON does not support infinite date values"

[Tim Smith <randomdev4+postgres@xxxxxxxxx>]

Hi,

As far as I'm aware, JSON has no data types as such, and so why is
Postgres (9.4.1) attempting to impose its own nonsense constraints ?
Surely it should just insert the word 'infinity' into the JSON output,
just like it displays in a simple SQL query ?

create table app_test.foo(a text,b date,c date,d boolean);

create view app_test.bar as select * from app_test.foo where
b<=now()::date and c>=now()::date and d=true;

insert into app_test.foo(a,b,c,d) values ('zzz','2014-12-31','2014-02-01',true);
insert into app_test.foo(a,b,c,d) values ('zzz','2015-02-01','infinity',true);


foobar=> select * from app_test.bar where a='zzz' order by c asc limit 1;
  a  |     b      |    c     | d
-----+------------+----------+---
 zzz | 2015-02-01 | infinity | t
(1 row)


CREATE FUNCTION app_test.foobar(p_a text) RETURNS json AS $$
DECLARE
v_row app_test.bar%ROWTYPE;
v_json json;
BEGIN
select * into strict v_row from app_test.bar where a=p_a order by c asc limit 1;
select row_to_json(v_row) into v_json;
return v_json;
END;
$$ LANGUAGE plpgsql;


foobar=> select app_test.foobar('zzz');
ERROR:  date out of range
DETAIL:  JSON does not support infinite date values.
CONTEXT:  SQL statement "select row_to_json(v_row)"
PL/pgSQL function app_test.foobar(text) line 7 at SQL statement


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