In an endless iOS list like a pin board, you want to stop the same item showing twice or the next page going missing. If you use a cursor instead of an offset, what state would you store alongside it?
Store the server's opaque cursor from the last successful response, bundled with hasMore, the in-flight request, and a key identifying which feed (sort, filter) it belongs to, so you never request the same cursor twice or reuse another feed's cursor.
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