Developer learns primitives should enforce structure, not domain meaning

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A software developer discovered an architectural flaw while auditing a foundational infrastructure primitive, finding it had been given authority to judge whether a value was meaningful rather than just structurally valid. The constraint had survived code reviews and redesigns, but closer examination revealed it was policing intent rather than enforcing memory safety or mathematical correctness. The issue came into focus with BoundedU64, where a restriction existed solely because domain semantics had been unconsciously embedded into pure mathematics. Removing the constraint required only a few lines of code, but the conceptual shift was significant: primitives should only verify structural validity and leave questions of meaning to higher domain layers. The experience reinforced a clear architectural principle — infrastructure owns structure, while meaning belongs to the domain.

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