The feed's cursor paging (sort_keys/order_by/keyset_predicate/encode/decode) is
the NULLS-LAST + tiebreaker algebra where a page-boundary bug hides as a
duplicated or skipped row on the busiest endpoint, and had zero tests. Seed 7
videos on 2 channels with duplicate sort values and NULLs across
published_at/view_count/duration/title/subscriber_count, then assert — for every
sort — that walking the feed in pages of 2 via the cursor reproduces exactly the
order a single unpaged query returns, with no duplicates.
peter
66c00327b1