The missing pg_get_*def functions

Existing:

pg_get_constraintdef
pg_get_indexdef
pg_get_viewdef
pg_get_triggerdef
pg_get_functiondef
pg_get_ruledef

Missing:

pg_get_ts_templatedef
pg_get_ts_parserdef
pg_get_ts_configdef
pg_get_ts_dictdef
pg_get_databasedef
pg_get_namespacedef
pg_get_languagedef
pg_get_conversiondef
pg_get_castdef
pg_get_amprocdef
pg_get_operatordef
pg_get_amopdef
pg_get_opfamilydef
pg_get_opclassdef
pg_get_tabledef
pg_get_sequencedef
pg_get_typedef
pg_get_attrdef

I'm planning to implement these. Is there any reason why the remaining
functions cannot be written as SQL functions instead of C? The input data
to the C-functions in pg_dump.c comes from pg_catalog anyway, so I thought
it would be a lot easier just to construct the definitions in SQL where you
have convenient access to the pg_catalog.