Proposed resolution:

This wording is relative to N5054.

1. Modify [thread.thread.class.general] as indicated:

   namespace std {
     class thread {
     public:
       […]
       // [thread.attributes], thread attributes
       template<same_as<char> T>
         class name_hint;
       template<class T>
         name_hint(const T*) -> name_hint<T>;
       template<class T, class Allocator>
         name_hint(basic_string<T, char_traits<T>, Allocator>) -> name_hint<T>;
       […]
     };
   }
   

Currently, there is a deduction guide for `std::thread::name_hint` that only accepts std::basic_string<T>. Given the corresponding constructor (see [thread.attributes.hint]) actually takes std::basic_string_view<T>, presumably it's more reasonable to make the deduction guide accept `basic_string` specializations with different allocator types (e.g. `std::pmr::string`).