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An Object.assign shim.
此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.greasyfork.icu/scripts/2666/7344/Objectassign%20shim.js
An Object.assign shim.
modified from https://github.com/es-shims/es6-shim.