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- 'use strict';
-
- module.exports = function union(object) {
- var _this = this;
-
- var collection = JSON.parse(JSON.stringify(this.items));
-
- Object.keys(object).forEach(function (prop) {
- if (_this.items[prop] === undefined) {
- collection[prop] = object[prop];
- }
- });
-
- return new this.constructor(collection);
- };
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