Best-effort string form of an arbitrary value for logging. Strings pass through; everything else is JSON-encoded, falling back to a placeholder for undefined or values that can't be serialised (e.g. cyclic).
undefined
Best-effort string form of an arbitrary value for logging. Strings pass through; everything else is JSON-encoded, falling back to a placeholder for
undefinedor values that can't be serialised (e.g. cyclic).