List characters in a CharacterSet (Swift 5)

characters.swift

// From https://stackoverflow.com/questions/34772439/see-characters-in-an-nscharacterset-swift
extension NSCharacterSet {
    var characters: [String] {
        var chars = [String]()
        for plane:UInt8 in 0...16 {
            if self.hasMemberInPlane(plane) {
            let p0 = UInt32(plane) << 16
            let p1 = (UInt32(plane) + 1) << 16
            for c:UTF32Char in p0..<p1 {
                if self.longCharacterIsMember(c) {
                        var c1 = c.littleEndian
                        let s = NSString(bytes: &c1, length: 4, encoding: String.Encoding.utf32LittleEndian.rawValue)!
                        chars.append(String(s))
                    }
                }
            }
        }
        return chars
    }
}