ES6 spec-compliant Object.assign shim. From https://github.com/es-shims/es6-shim
ES6 spec-compliant RegExp.prototype.flags shim.
An ES2015 spec-compliant Function.prototype.name
shim
Get the byte length of an ArrayBuffer, even in engines without a .byteLength
method.
ECMAScript spec-compliant polyfill/shim for globalThis