Protocol question: PreferMinimalContainer

Given that an AnnotationContainer document doesn't every include `items` direction-only links to `first` and/or `last` pages-what is the value add of `PreferMinimalContainer`?

http://w3c.github.io/web-annotation/protocol/wd/#client-preferences

It seems that the response to that request would be identical to either the default (PreferContainedDescriptions) or, given the preference for minimalism, it would be identical to PreferContainedIRIs-in which case one or the other of these isn't needed.

Each of these preferences really only dictates the IRIs used for `first` and `last` afaict.

Or am I missing something obvious? :)

Cheers!
Benjamin

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