confusing documentation of *_membership attributes of group resource

https://docs.puppetlabs.com/references/4.1.stable/type.html#group

Group has an auth_membership attribute which controls whether or not any members not listed are removed from the group. This is very much not clear from the documentation description. Can we get a documentation update?

auth_membership
whether the provider is authoritative for group membership.

Valid values are true, false, yes, no.

Further, the wording of attribute_membership is even worse. I cannot fathom what this attribute does, or what the values mean in that context:

attribute_membership
Whether specified attribute value pairs should be treated as the only attributes of the user or whether they should merely be treated as the minimum list.

Valid values are inclusive, minimum.