Object.entries not served for Google AdsBot

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Our rollbar error log files show errors for Object.entries with browser AdsBot-Google (+http://www.google.com/adsbot.html). We expected Object.entries to be polyfilled.

Our api call: https://cdn.polyfill.io/v2/polyfill.min.js?features=default,es2015,es2016,es2017,fetch

After investigation it seems that the browser is not listed at the polyfill: https://github.com/Financial-Times/polyfill-library/blob/master/polyfills/Object/entries/config.json

I am not sure what the problem is, it could be:

1. That the browser agent string is recognising it as another browser, making polyfill.io think it doesn't need it
2. Not recognising the browser at all and thus serving no polyfills

If it is 2. I would rather have the behavior that simply serves all polyfills with detect scripts.

For completeness, here are the user agent strings of the different Google bots: https://support.google.com/webmasters/answer/1061943?hl=en

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I just discovered unknown=polyfill