Now that we are using C++20, we can use C++17 Variadic templates and resolve the FIXME pertaining to that.
*** Bug 264100 has been marked as a duplicate of this bug. ***
Committed 270214@main (8f9df93cc584): <https://commits.webkit.org/270214@main> Reviewed commits have been landed. Closing PR #19893 and removing active labels.
<rdar://problem/117926529>