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Reasons from operational semantics, type-theoretic invariants, and soundness as preservation-plus-progress through Ott/LN-defined calculi, Coq/Isabelle/Agda mechanization, Hindley-Milner inference, and abstract-interpretation Galois connections while treating stuck terms, blame escaping onto well-typed pure terms, broken substitution and canonical-forms lemmas, and unsound widening as first-class failure modes.