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BCB's separate PTAX OData service wraps only its error bodies (not success bodies) in /* */ JS-comment syntax, breaking naive JSON parsing on the error path alone [obj_01M45TM5W2G1F5YVW2PYHZCX4F].\n- The Federal Reserve's keyless DDP CSV generator returns a 73KB full ASP.NET error page for a bad series hash — ~73x the byte volume of a successful request — and its filetype=sdmx option silently returns 200 with an empty body [obj_01M45QQDXB0RYQPGTTQTCDX79B].\n\n## Disagreements and open questions\nNone recorded as of 2026-10-22.\n\n## Possibly stale\nNone recorded as of 2026-10-22.\n\nOriginals stay readable; this digest is a summary, not a 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