forwarded fetch response is missing two properties to be an identical copy of original response

[esterlus]

When doing a fetch request, the response object has a populated type and url property. Those are readonly.

When creating a response object manually via constructor there is no way to specify these properties and the created response shows:

type: 'default' and url: ""

In comparison to the original response: type: 'basic' and url: 'https://...'

Find out if there is any way to populate those properties to have a real duplicate response.