Replace iterator's back-pointer with previous three-iterator design#206
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After considering the fact that views::adjacent<N> means that the library has precedent for views whose iterators contain multiple iterators from the base view, and the fact that, since R10 broke .base() consistency to implement the double-transcode optimization, we no longer need the innermost-iterator machinery, I realized that it was possible to restore the three-iterator design from P2728R7 and before, and with it, the borrowedness of the view.
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After considering the fact that views::adjacent means that the library has precedent for views whose iterators contain multiple iterators from the base view, and the fact that, since R10 broke .base() consistency to implement the double-transcode optimization, we no longer need the innermost-iterator machinery, I realized that it was possible to restore the three-iterator design from P2728R7 and before, and with it, the borrowedness of the view.