Interface UpdatePolicy

Policy switches for RRStack.update(). Defaults:

• onVersionUp: 'off'; onVersionDown: 'error'; onVersionInvalid: 'error';
• onTimeUnitChange: 'warn'.

Example: accept newer versions with a warning and surface time‑unit changes

stack.update(incoming, {
  onVersionDown: 'warn',
  onTimeUnitChange: 'warn',
  onNotice: (n) => {
    // route to your logger/telemetry
    logger.info({ notice: n });
  },
});
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React passthrough: When supplied via useRRStack({ policy }), this policy is applied to both:

• prop ingestion (json → engine), and
• staged UI commits (timezone/rules/timeUnit).