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+'use strict';
+
+var ES2016 = require('./es2016');
+var assign = require('./helpers/assign');
+
+var ES2017 = assign(assign({}, ES2016), {
+ ToIndex: function ToIndex(value) {
+ if (typeof value === 'undefined') {
+ return 0;
+ }
+ var integerIndex = this.ToInteger(value);
+ if (integerIndex < 0) {
+ throw new RangeError('index must be >= 0');
+ }
+ var index = this.ToLength(integerIndex);
+ if (!this.SameValueZero(integerIndex, index)) {
+ throw new RangeError('index must be >= 0 and < 2 ** 53 - 1');
+ }
+ return index;
+ }
+});
+
+delete ES2017.EnumerableOwnNames; // replaced with EnumerableOwnProperties
+
+module.exports = ES2017;