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TONL (Type-Oriented Notation Language) is a JSON superset with explicit type hints. It offers better schema clarity while maintaining JSON compatibility.
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.
Use TOON when building LLM-powered applications, optimizing API costs, or when you need compact, readable data for AI models.