BUG #12088: pg_upgrade 9.3 -> 9.4rc1 - implicit cast not ported

The following bug has been logged on the website:

Bug reference:      12088
Logged by:          Marco Colombo
Email address:      ing.marco.colombo@gmail.com
PostgreSQL version: 9.4beta2
Operating system:   Centos 7 64bit
Description:

Hi, we have defined some implicit cast in the schema. After pg_upgrade
process, these have been dropped and we had to create them again.

Cast are defined as:

create cast (varchar as numeric) with inout as implicit;

create cast (unknown as numeric) with inout as implicit;

create cast (unknown as text) with inout as implicit;

create cast (unknown as integer) with inout as implicit;