BUG #4330: Bonjour connections ignore hba config METHOD and always trusted

The following bug has been logged online:

Bug reference:      4330
Logged by:          William Kyngesburye
Email address:      kyngchaos@kyngchaos.com
PostgreSQL version: 8.3.1
Operating system:   Mac OS X 10.4.11
Description:        Bonjour connections ignore hba config METHOD and always
trusted
Details:

I have a role configured for local IP connection with md5 authentication.
When using the postgres server IP or DNS name from a local network
connection, if correctly prompts for the role's password.

When connection with the Bonjour name of the postgres server, it ignores the
md5 setting and always trusts the connection.  I tried with other auth
methods with the same effect.

This is bad.