The excellent @sarah-quinones has pointed out to me that the current design of ArrayRef is unsound and can cause use-after-free without the use of any unsafe. She has also provided a feasible path forward for a redesign that should be relatively small. However, I feel obliged to yank 0.17.0 to avoid leaving use-after-free inside the core of the library.

My apologies to everyone, especially those contributors whose contributions will be temporarily unavailable. I will work as fast as I can to get a new version up, which I will be submitting to some rigorous review before its release (0.17.1). I appreciate everybody's patience as I work through this.