Promise#finally polyfill doesn't add finally method to fetch() results

[wa-Nadoo]

Affected browsers: at least FF 57 and Edge 16
Affected versions: core-js@^2.5.0

Reproducible example:

import 'core-js/fn/promise/finally'
typeof fetch('https://gooogle.com').finally
> "undefined"

If include polyfill partially then following code works as expected:

import 'core-js/modules/es7.promise.finally'
typeof fetch('https://gooogle.com').finally
> "function"

Online demo

[zloirock]

It's a duplicate of issues like #332 or #178.

[wa-Nadoo]

Ok. I will close it.