pg_dumpall: pg_conversion table not saved

Hi list,
I updated pg_converion to set the condefault=false where I need it.
pg_dumpall does NOT write that table out and therefore it is not possible to restore, this update get lost.
Anybody know if this is an error or has an explanation why it has to work this way?

Background:
I have created my own conversion with CREATE DEFAULT CONVERSION ...
http://www.postgresql.org/docs/8.3/interactive/sql-createconversion.html
> There should be only one default encoding in a schema for the encoding pair

Why can not the "CREATE DEFAULT CONVERSION ..."
a) return with an error if there is another default conversion existing or
b) silently set any other default to false
for the confor- and conto-encoding involved?

Regards,
Michael

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