Goedenavond TAG! This is not your typical spec review, and is highly related to #320. But, because @torgo asked nicely, I'm opening up a review for a specific application of UA-CH as a replacement for the User-Agent string. We've had a lot of feedback on the intent, which resulted in changes to the API we want to ship. It also resulted in many open issues. Most either have pending PRs or will have

