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A std::pair or std::tuple whose every element is itself a two-element array with a string first element (e.g. std::pair<std::string, int>) serializes to a JSON object instead of a JSON array, because to_json builds the value with a brace initializer and the initializer-list object-detection rule fires. The resulting object cannot be read back into the original type and collapses duplicate keys. Document this quirk in the conversions guide, together with the unaffected cases and the idiom to force an array. Claude-Session: https://claude.ai/code/session_016cwQq8WQRFzQcGQtbJTtJg Signed-off-by: Claude <noreply@anthropic.com> Co-authored-by: Claude <noreply@anthropic.com>
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