For compatibility reasons, platform.mac_ver() may return 10.16 instead of 11.0. In WebKit, we always want the actual macOS version, and should prefer the version as reported by sw_vers.
<rdar://problem/69462735>
Created attachment 409508 [details] Patch
Committed r267508: <https://trac.webkit.org/changeset/267508> All reviewed patches have been landed. Closing bug and clearing flags on attachment 409508 [details].