debug_level 0 does not stop debug messages

JP (smasher(at)bikerider(dot)com) reports a bug with a severity of 2
The lower the number the more severe it is.

Short Description
debug_level 0 does not stop debug messages

Long Description
I'm trying to silence the annoying output generated by vacuum. I've
tried both command line options (-d 0, -S (with syslog enabled)) and
postgresql.conf (debug_level = 0, silent_mode = 1). Setting debug
level to 0 should silence these messages, but still let errors through. Setting debug level higher seems to generate more output, which is great. just be nice if the vacuum output were at level 3 or
greater.

Platform: OpenBSD 2.8 (i386)
PG Version: 7.1

Sample Code

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