text: // Copyright (C) 2021 Igalia, S.L. All rights reserved.
  // This code is governed by the BSD license found in the LICENSE file.
  
  /*---
  esid: sec-temporal.plaindate.prototype.add
  description: Fallback value for overflow option
  info: |
      sec-getoption step 3:
        3. If _value_ is *undefined*, return _fallback_.
      sec-temporal-totemporaloverflow step 1:
        1. Return ? GetOption(_normalizedOptions_, *"overflow"*, « String », « *"constrain"*, *"reject"* », *"constrain"*).
      sec-temporal.calendar.prototype.dateadd step 7:
        7. Let _overflow_ be ? ToTemporalOverflow(_options_).
      sec-temporal.plaindate.prototype.add step 7:
        7. Return ? CalendarDateAdd(_temporalDate_.[[Calendar]], _temporalDate_, _balancedDuration_, _options_).
  includes: [temporalHelpers.js]
  features: [Temporal]
  ---*/
  
  const date = new Temporal.PlainDate(2000, 5, 31);
  const duration = new Temporal.Duration(3, 1);
  
  const explicit = date.add(duration, { overflow: undefined });
  TemporalHelpers.assertPlainDate(explicit, 2003, 6, "M06", 30, "default overflow is constrain");
  const implicit = date.add(duration, {});
  TemporalHelpers.assertPlainDate(implicit, 2003, 6, "M06", 30, "default overflow is constrain");
  const lambda = date.add(duration, () => {});
  TemporalHelpers.assertPlainDate(lambda, 2003, 6, "M06", 30, "default overflow is constrain");
  