old_contents: 'use strict';
  var $ = require('../internals/export');
  var addToUnscopables = require('../internals/add-to-unscopables');
  var doesNotExceedSafeInteger = require('../internals/does-not-exceed-safe-integer');
  var lengthOfArrayLike = require('../internals/length-of-array-like');
  var toAbsoluteIndex = require('../internals/to-absolute-index');
  var toIndexedObject = require('../internals/to-indexed-object');
  var toIntegerOrInfinity = require('../internals/to-integer-or-infinity');
  
  var $Array = Array;
  var max = Math.max;
  var min = Math.min;
  
  // `Array.prototype.toSpliced` method
  // https://tc39.es/proposal-change-array-by-copy/#sec-array.prototype.toSpliced
  $({ target: 'Array', proto: true, arity: 2 }, {
    toSpliced: function toSpliced(start, deleteCount /* , ...items */) {
      var O = toIndexedObject(this);
      var len = lengthOfArrayLike(O);
      var actualStart = toAbsoluteIndex(start, len);
      var argumentsLength = arguments.length;
      var k = 0;
      var insertCount, actualDeleteCount, newLen, A;
      if (argumentsLength === 0) {
        insertCount = actualDeleteCount = 0;
      } else if (argumentsLength === 1) {
        insertCount = 0;
        actualDeleteCount = len - actualStart;
      } else {
        insertCount = argumentsLength - 2;
        actualDeleteCount = min(max(toIntegerOrInfinity(deleteCount), 0), len - actualStart);
      }
      newLen = doesNotExceedSafeInteger(len + insertCount - actualDeleteCount);
      A = $Array(newLen);
  
      for (; k < actualStart; k++) A[k] = O[k];
      for (; k < actualStart + insertCount; k++) A[k] = arguments[k - actualStart + 2];
      for (; k < newLen; k++) A[k] = O[k + actualDeleteCount - insertCount];
  
      return A;
    }
  });
  
  addToUnscopables('toSpliced');
  
new_contents: 'use strict';
  var $ = require('../internals/export');
  var addToUnscopables = require('../internals/add-to-unscopables');
  var doesNotExceedSafeInteger = require('../internals/does-not-exceed-safe-integer');
  var lengthOfArrayLike = require('../internals/length-of-array-like');
  var toAbsoluteIndex = require('../internals/to-absolute-index');
  var toIndexedObject = require('../internals/to-indexed-object');
  var toIntegerOrInfinity = require('../internals/to-integer-or-infinity');
  
  var $Array = Array;
  var max = Math.max;
  var min = Math.min;
  
  // `Array.prototype.toSpliced` method
  // https://tc39.es/proposal-change-array-by-copy/#sec-array.prototype.toSpliced
  $({ target: 'Array', proto: true }, {
    toSpliced: function toSpliced(start, deleteCount /* , ...items */) {
      var O = toIndexedObject(this);
      var len = lengthOfArrayLike(O);
      var actualStart = toAbsoluteIndex(start, len);
      var argumentsLength = arguments.length;
      var k = 0;
      var insertCount, actualDeleteCount, newLen, A;
      if (argumentsLength === 0) {
        insertCount = actualDeleteCount = 0;
      } else if (argumentsLength === 1) {
        insertCount = 0;
        actualDeleteCount = len - actualStart;
      } else {
        insertCount = argumentsLength - 2;
        actualDeleteCount = min(max(toIntegerOrInfinity(deleteCount), 0), len - actualStart);
      }
      newLen = doesNotExceedSafeInteger(len + insertCount - actualDeleteCount);
      A = $Array(newLen);
  
      for (; k < actualStart; k++) A[k] = O[k];
      for (; k < actualStart + insertCount; k++) A[k] = arguments[k - actualStart + 2];
      for (; k < newLen; k++) A[k] = O[k + actualDeleteCount - insertCount];
  
      return A;
    }
  });
  
  addToUnscopables('toSpliced');
  
subject: drop an unnecessary option