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.