Rather than using an array for the command/description tuple, do you think it's better to make a value type for it?  

Actually, I'm wondering if we want this method at all...the `#` prefix for the description feels like formatting to me, where as this method is intended just to be the data, right?  And once we remove that I don't think this method helps anything...it converts `failed_examples` from an array of objects with an explicit interface to an array of tuples that have an implicit interface (e.g. the unlabeled ordering of the two attributes).

If someone wants to output their own rerun commands they're better off using the underlying `failed_examples` anyway since it provides more data and thus is more flexible.