Need more options around the autoPurge

Autopurge feature is very nice but is too restrictive.

Actually with autopurge 'on' over a schema, all versions will be deleted
With autopurge 'off', all versions will be kept.

In order to secure our production environment, we should be able to say : let's keep only x days of version of this schema
or let's keep only x versions of this schema.

I know there is an endpoint acception a date for purge, but it's not accepting a date + a schema type.