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Iterator Protocol

The library no longer guarantees or relies on the direct presence of advance / distance / next / prior / type members in iterator types; the following table summarises the new requirements:

Before Now
i::type deref<i>::type
i::next next<i>::type
i::prior prior<i>::type
i::advance<n>::type advance<i,n>::type
i::distance<j>::type distance<i,j>::type
i::category i::category