Stone.js API
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    A single validation problem, normalised across engines.

    interface ValidationIssue {
        code?: string;
        message: string;
        path: (string | number)[];
    }
    Index
    code?: string

    Optional engine/rule code (e.g. too_small).

    message: string

    Human-readable message.

    path: (string | number)[]

    Property path to the offending value (e.g. ['user', 'email']).