non-enumerable object properties are lost after passing an object to workerize.

从 workerize-loader 示例开始，重现 Firebase 对象与过滤结果之间报告的差异。检查 worker 调用边界和 README，以确定保留不可枚举属性是否是预期行为。完成标准是：要么在调用过程中保留 id 属性，要么清楚地记录观察到的行为。

Here's a real life example:

// The main thread
import Worker from 'workerize-loader!./workers';
import getCompaniesFromFirebase from './getCompaniesFromFirebase';

const worker = Worker();

const {
  filterCompaniesByTypes
  // Other modules
} = worker;

(async () => {
  const companies = await getCompaniesFromFirebase();
  // typeof companies[0].id === "string" // true

  const companiesFiltered = await filterCompaniesByTypes(companies, ['company-type-1', 'company-type-2']);
  // typeof companiesFiltered[0].id === "string" // false
  // typeof companiesFiltered[0].id === "undefined" // true
})();

// The worker
import intersection from 'lodash/intersection';

export const filterCompaniesByTypes = (companies, typesToFilerBy) => {
  return companies.filter(({ types, id }) => {
    // typeof id === 'undefined' // true
    return intersection(types, typesToFilerBy).length > 0;
  });
};

In the given example the getCompaniesFromFirebase() function returns an array of objects. Each object has some properties, inluding the id property that is non-enumerable.

After executing the filterCompaniesByTypes() function (which is a web worker function) I receive a filtered array. All id properties are gone.

if it's the desired behaviour (or an unpleasant, but expected, side-effect) not a bug, then it would be good to mention it in the readme.