Pleroma, however, is a different story - a better story
here is my Pleroma account, listing my private inbox collection - essentially my home timeline
this is not public, but available to ActivityPub C2S clients like browser.pub with a valid auth token
Under the hood, the personal inbox is represented as an essentially infinite ActivityPub OrderedCollection, with no 'totalItems' count property, and no 'last' pointer
I can keep iterating down my inbox reverse chron this way in the json...