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'use strict';
const Schema = require('../../lib/schema');const assert = require('assert');const castUpdate = require('../../lib/helpers/query/castUpdate');
describe('castUpdate', function() {  it('avoids adding `$each` if `$addToSet` on mixed array (gh-11284)', function() {    const schema = new Schema({ test: [] });    const obj = { $addToSet: { test: [1, 2, 3] } };
    const res = castUpdate(schema, obj);    assert.deepEqual(res, { $addToSet: { test: [1, 2, 3] } });  });});