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TOON (Token-Oriented Object Notation) is a line-oriented format optimized for LLMs. It reduces token count by 20-60% compared to JSON while maintaining readability.
TONL (Type-Oriented Notation Language) is a JSON superset with explicit type hints. It offers better schema clarity while maintaining JSON compatibility.
Use TONL when you need type clarity without losing JSON compatibility, or when documenting complex data schemas.