If I were building an app that calls this API, and I got back a `GAReadAlignment` object that said it was secondary (or supplement), I'd want to know how to find the object(s) for my corresponding primary (or representative) `GAReadAlignment`s. I think the answer is pretty much the same as it is in today's SAM-centric world -- *"as you walk through the genome, collect all alignments with the same `fragmentName`, and then use the flags to figure out what goes with what"*. Is that right, or is there a better answer?

Note that I can imagine other answers that require extra work on the backend (e.g. indexing `fragmentName` to allow search, or embedding the other alignments in the response). And those might make sense as enhancements down the road, if we see demand. But I do **not** think we should add that implementation complexity today; I'm just making sure callers will understand how to work with today's implementation.