Alternative ways of obtaining device information (other than UA string)?

HI folks,

This is a great project. I'm starting to get into the details of this solution, as companies are starting to ask for it.

Reading the docs, it seems like you are using the UA string to obtain some device info. Now that there's an ongoing proposal to [deprecate and freeze the UA](https://groups.google.com/a/chromium.org/forum/?oldui=1#!topic/blink-dev/-2JIRNMWJ7s), are you thinking on alternative ways of obtaining this info?

Seems like the most obvious one would be using client-hints (which you have already discussed [here](https://github.com/GoogleChromeLabs/adaptive-loading/issues/39)). The current limitation being that you can't get these signals in the first page load (although [that might change](https://github.com/WICG/client-hints-infrastructure/issues/16)).

I'm wondering if you guys are contemplating this scenario, and have any thoughts or recommendations around it.