BUG #3661: Missing equality comparator: string = integer

The following bug has been logged online:

Bug reference: 3661
Logged by: David Bachmann
Email address: david(dot)bachmann(at)ersystems(dot)ch
PostgreSQL version: 8.3-beta1
Operating system: Windows XP
Description: Missing equality comparator: string = integer
Details:

This does not function any more under PG 8.3-beta1:

select '5'::varchar = 5;
ERROR: operator does not exist: character varying = integer

select '5'::char = 5;
ERROR: operator does not exist: character = integer

Note that this still works:
select '5' = 5;