How it feels to learn JavaScript in 2016

[T.J. Crowder]

On Sat, Nov 25, 2017 at 6:09 AM, kai zhu <kaizhu256 at gmail.com> wrote:
> introducing the new typeof Symbol() === 'symbol' does break
> backwards compatibility with many es5 libraries that default to
> 'object' type if typeof is not 'boolean', 'number', 'string',
> 'function', or 'undefined'.

Which ones, **specifically**?

-- T.J. Crowder