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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);
};