webkit: limit user agent versioning to an upper bound
▻https://bugs.webkit.org/show_bug.cgi?id=180365
“Stop reporting more recent user agent version strings, freezing the version at a specific moment in time. We should do this for a number of reasons: (1) User Agent sniffing is a terrible way to determine whether a browser supports certain features. (2) Bad User Agent sniffing code on the web create compatibility problems every time we update the versions. (3) Overly-specific version information provides useful fingerprinting data while providing almost no user benefit.”