A Format Can Save Tokens and Still Be Unreadable. We Measured It.
bpp wins on tokens and loses on being read correctly. Across 8 models and ~770K records, mean comprehension error was GCF 31% / JSON 40% / bpp 54%. The failure is mechanical: bpp interns repeated values into a pointer table and models return the pointer instead of the value. The token saving is erased the moment you price the errors.