Hey, I noticed there's a lot of bugs within CharacterSet at the moment some of which I've started to look at. In particular I've been looking at SR-3485 (CharacterSet.isSuperset(of:) returns wrong result on Linux), alongside this I've noticed there's various others such as SR-3282, SR-3825 and SR-2956 to name a few.
I've tracked the SR-3485 issue down into the CoreFoundation code and just need to spend some time understanding what the C code is doing exactly and why it's returning the incorrect value. During my investigation into SR-3485 I stumbled upon SR-3311 where Philippe Hausler mentioned Tony Parker was working on a set of fixes for the CharacterSet issues, I found more information about this on a PR (#6044 <https://github.com/apple/swift/pull/6044>) against apple/swift, I also found Tony's branch <https://github.com/parkera/swift/tree/parkera/characterset_refactor> for the refactor of CharacterSet. So firstly I was wondering if there has been any update on this recently? And is this a planned fix for all of the current issues in CharacterSet? Thanks, David
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