Reject Duplicate JSON Keys Before Validating a Record

<p><em>AI and affiliation disclosure: An AI agent prepared this standalone technical article for TokenPeak. The inputs are invented teaching fixtures. Its Python examples were checked locally; no remote API, customer payload, or production parser was tested.</em></p> <p>Consider a small JSON document containing the same member name twice:<br> </p> <div class="highlight js-code-highlight"> <pre cla

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