10.4 upgrade, function markings, and template0

Good afternoon,

The PostgreSQL 10.4 upgrade involves changes to some function markings (see release notes, E.1.2, second and third
bulletpoints for specifics). One way to make these changes is to use `ALTER FUNCTION` to change the functions in your
existingdatabases. While this was mainly straightforward, I'm unclear on whether the `template0` database must be
changedin this manner or if it is automatically updated when the upgrade is applied. The documentation indicates that
ingeneral you shouldn't manually change the `template0` database.
 


-- 
Dominic Jones <jonesd@xmission.com>