Proposed resolution:

This wording is relative to N4830.

1. Modify [range.subrange] as indicated:

   namespace std::ranges {
     template<class From, class To>
       concept convertible-to-non-slicing = // exposition only
         convertible_to<From, To> &&
         !(is_pointer_v<decay_t<From>> &&
         is_pointer_v<decay_t<To>> &&
         not-same-as<remove_pointer_t<decay_t<From>>, remove_pointer_t<decay_t<To>>>);
         
     template<class T>
       concept pair-like = // exposition only
         […]
         
     template<class T, class U, class V>
       concept pair-like-convertible-to = // exposition only
         !range<T> && pair-like<remove_reference_t<T>> &&
         requires(T&& t) {
           { get<0>(std::forward<T>(t)) } -> convertible_to<U>;
           { get<1>(std::forward<T>(t)) } -> convertible_to<V>;
         };
         
      template<class T, class U, class V>
        concept pair-like-convertible-from = // exposition only
          !range<T> && pair-like<T> && 
          constructible_from<T, U, V> &&
          convertible-to-non-slicing<U, tuple_element_t<0, T>> &&
          convertible_to<V, tuple_element_t<1, T>>;
   
   […]
   […]
     template<input_or_output_iterator I, sentinel_for<I> S = I, subrange_kind K =
              sized_sentinel_for<S, I> ? subrange_kind::sized : subrange_kind::unsized>
       requires (K == subrange_kind::sized || !sized_sentinel_for<S, I>)
     class subrange : public view_interface<subrange<I, S, K>> {
     private:
       […]
     public:
       subrange() = default;
       
       constexpr subrange(convertible-to-non-slicing<I> auto i, S s) requires (!StoreSize);
       
       constexpr subrange(convertible-to-non-slicing<I> auto i, S s, 
                          make-unsigned-like-t(iter_difference_t<I>) n) requires (K == subrange_kind::sized);
       
       template<not-same-as<subrange> R>
         requires forwarding-range<R> &&
           convertible_toconvertible-to-non-slicing<iterator_t<R>, I> && 
           convertible_to<sentinel_t<R>, S>
       constexpr subrange(R&& r) requires (!StoreSize || sized_range<R>);
       
       template<forwarding-range R>
         requires convertible_toconvertible-to-non-slicing<iterator_t<R>, I> && 
   	    convertible_to<sentinel_t<R>, S>
       constexpr subrange(R&& r, make-unsigned-like-t(iter_difference_t<I>) n)
         requires (K == subrange_kind::sized)
           : subrange{ranges::begin(r), ranges::end(r), n}
       {}
       
       template<not-same-as<subrange> PairLike>
         requires pair-like-convertible-to<PairLike, I, S>
       constexpr subrange(PairLike&& r) requires (!StoreSize)
         : subrange{std::get<0>(std::forward<PairLike>(r)),
                    std::get<1>(std::forward<PairLike>(r))}
       {}
   
       template<pair-like-convertible-to<I, S> PairLike>
       constexpr subrange(PairLike&& r, make-unsigned-like-t(iter_difference_t<I>) n)
         requires (K == subrange_kind::sized)
         : subrange{std::get<0>(std::forward<PairLike>(r)),
                    std::get<1>(std::forward<PairLike>(r)), n}
       {}
     […]
     };
     
     template<input_or_output_iterator I, sentinel_for<I> S>
     subrange(I, S) -> subrange<I, S>;  
     
     […]
   }
   

2. Modify [range.subrange.ctor] as indicated:

   constexpr subrange(convertible-to-non-slicing<I> auto i, S s) requires (!StoreSize);
   

   -1- Expects: […]

   […]

   constexpr subrange(convertible-to-non-slicing<I> auto i, S s, 
                      make-unsigned-like-t(iter_difference_t<I>) n) requires (K == subrange_kind::sized);
   

   -2- Expects: […]

   […]

   template<not-same-as<subrange> R>
     requires forwarding-range<R> &&
       convertible_toconvertible-to-non-slicing<iterator_t<R>, I> && 
       convertible_to<sentinel_t<R>, S>
   constexpr subrange(R&& r) requires (!StoreSize || sized_range<R>);
   

   -6- Effects: […]

   […]