Crashes on frequent setting of attributedString

[ahmedk92]

Can be easily reproduced if the font size slider events set to continuous in the demo.

[ahmedk92]

One way to work around it is to throttle change (via a Timer for example as shown in the demo).

    @IBAction private func fontSizeSliderValueChanged(_ sender: UISlider) {
        throttleTimer?.invalidate()
        throttleTimer = nil
        throttleTimer = Timer.scheduledTimer(withTimeInterval: 0.1, repeats: false, block: { [weak self] (_) in
            guard let self = self else {
                return
            }
            self.attrStr.setAttributes([
                NSAttributedString.Key.font: font.withSize(CGFloat(sender.value))
                ], range: NSMakeRange(0, self.attrStr.length))
            
            self.textView.attributedString = self.attrStr
        })
    }

Not sure if it's an acceptable solution that can be implemented at the library level.