Thank you for writing and for your valuable feedback Brian. Based on your
feedback, I was going to hold off on releasing my proposed v3 and go with
your suggestion of writing an IsFinite() method so that my module could
panic if it detects that code would run forever.
But I started thinking
Maybe you're overthinking this. One option would be for Number to have a
boolean attribute saying whether it's definitely finite, exposed as an
IsFinite() method on Sequence. Calling FindLast() on a sequence where
IsFinite() is false would panic. It's not compile-time safe, but it's
better
