Ignoring them would result in breaking them with any hand edits, I think. This spec seems to create chunks of markdown documents that (almost) cannot be edited

Ignoring them would result in breaking them with any hand edits, I think. This spec seems to create chunks of markdown documents that (almost) cannot be edited by hand -- any change you make that affects the offsets in the `Annotations` range requires you to update all the references character-offsets. (And any changes made within the annotation range itself require recomputing the hash as well as updating the ranges.) The only change you can make to one of these documents by hand is to add further content after the annotated ranges.