pg_dump not dumping default_text_search_config WAI?

I just got bitten by dumping and restoring a database to a new cluster,
and the default_text_search_config was not copied for the database. 

A check of the dump file shows no 'ALTER DATABASE' command. 

I used an 'ALTER DATABASE...' to set it correctly and then did a dump,
and the config was not in the dump. 

From my understanding this is a cluster setting that only applies to
this database, and ISTM that database config *should* be in the dump. 

Is this WAI? Are there other database settings that are not exported by
a pg_dump?