Circle V2 API Docs
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    Variable checkboxStateSchemaConst

    checkboxStateSchema: ZodEnum<
        { checked: "checked"; unchecked: "unchecked"; unknown: "unknown" },
    > = ...

    A checkbox's answer as three distinct states. v1 typed this as z.boolean() with a describe that mentioned "N/A" — unsatisfiable under strict mode, so the model had to guess true/false for a box it had no evidence about. unknown is the honest third option.