update open discussion

P0959.md

@@ -825,9 +825,21 @@ auto id1 = uuid::from_string("47183823-2574-4bfd-b411-99ed177d3e43"); // [1]
 std::string str{ "47183823-2574-4bfd-b411-99ed177d3e43" };
 auto id2 = uuid::from_string(str);                                    // [2]
 ```
-Because there is no implicit conversion from `std::basic_string` to `std::basic_string_view`, [2] would not work. Instead, it should be:
+Because template argument deduction does not work, both [1] and [2] would produce compiler errors. Instead, it should be one of the following, neither being desirable.
 ```cpp
-auto id2 = uuid::from_string(std::string_view {str});
+auto id1 = uuid::from_string(
+   std::string_view {"47183823-2574-4bfd-b411-99ed177d3e43"});        // [1]
+
+std::string str{ "47183823-2574-4bfd-b411-99ed177d3e43" };
+auto id2 = uuid::from_string(std::string_view {str});                 // [2]
+```
+or
+```cpp
+auto id1 = uuid::from_string<char, std::char_traits<char>>(
+   "47183823-2574-4bfd-b411-99ed177d3e43");                           // [1]
+
+std::string str{ "47183823-2574-4bfd-b411-99ed177d3e43" };
+auto id2 = uuid::from_string<char, std::char_traits<char>>(str);      // [2]
 ```
 
 #### Need more explanations about the choices of ordering and how the RFC works in that regard.