I’ve reported a few browser bugs myself, none have been fixed (even years later). I’ll still do it, though, because it may help someone else out someday.
Isn't it this one? https://bugs.webkit.org/show_bug.cgi?id=188794
Re:iOS 12 Safari Array reverse bug
by scarface74 on Wednesday September 19, 2018 @01:34PM
(#18025989)
According to the linked SO post, it has already been corrected in a technology preview.
It is worrying... but as someone who has filed my fair share of bug reports to all the major browser projects it's also understandable. Filling good bug reports takes effort, especially for the more obscure ones to produce small and reliable test cases. In my experience only the largest projects have the man power to acknowledge let alone address all bug reports. I abandoned reporting bugs to IE, Edge and Safari long ago because this effort often goes to waste.
I get it though, browsers are one of the largest most complex incoherent pieces of software everyone uses today, but that's also why I think only fully open source (well engaged) projects work well in this area.
As an aside: This is the same reason I think the browser needs to get simple again (without loosing capability) - RE James Mickens thoughts on this. Then browser diversity and man power becomes a moot point.