So: does DIP25 allow safe slices? Looks that way
I believe it does, but at the cost of forced reference counting. As I pointed out, the `ref` solution is not applicable to slices, therefore it needs to return an RCArray. This in turn forces an inc/dec whenever it is sliced or copied, and - maybe worse - it requires all consumers to support RCArray (or whatever other idiosyncratic RC implementation users come up with).
