text: // Copyright (C) 2017 Daniel Ehrenberg. All rights reserved.
  // Copyright (C) 2019 Igalia S.L. All rights reserved.
  // This code is governed by the BSD license found in the LICENSE file.
  
  /*---
  esid: sec-initializenumberformat
  description: >
    Monkey-patching Object.prototype does not change the default
    options for NumberFormat as a null prototype is used.
  info: |
    InitializeNumberFormat ( numberFormat, locales, options )
  
      1. If _options_ is *undefined*, then
        1. Let _options_ be ObjectCreate(*null*).
  locale: [en-US]
  features: [BigInt]
  ---*/
  
  Object.prototype.useGrouping = false;
  assert.sameValue(12345n.toLocaleString("en-US"), "12,345");
  