Does this type satisfy the requirements of Sequence and IteratorProtocol?

[Jens]

@nnnnnnnn

This is a pretty solid compilation of the problems with actually having Sequence model single-pass sequences. At the use site, their behavior is incomprehensible and essentially undefined once a single operation has been performed.

cc @soroush @Ben_Cohen

I just found an old thread with a very long and interesting previous discussion on this topic:
[Pitch] Remove destructive consumption from Sequence
cc @dwaite @anandabits @dabrahams