constexpr explicit sentinel(zentinel<Const> inner);
constexpr sentinel(sentinel<!Const> i)
requires Const && convertible_to<zentinel<false>, zentinel<Const>>;
template<bool OtherConst>
requires sentinel_for<zentinel<Const>, ziperator<OtherConst>>
friend constexpr bool operator==(const iterator<OtherConst>& x, const sentinel& y);
template<bool OtherConst>
requires sized_sentinel_for<zentinel<Const>, ziperator<OtherConst>>
friend constexpr range_difference_t<maybe-const<OtherConst, InnerView>>
operator-(const iterator<OtherConst>& x, const sentinel& y);
template<bool OtherConst>
requires sized_sentinel_for<zentinel<Const>, ziperator<OtherConst>>
friend constexpr range_difference_t<maybe-const<OtherConst, InnerView>>
operator-(const sentinel& x, const iterator<OtherConst>& y);