update condition

include/nlohmann/detail/json_pointer.hpp

@@ -678,21 +678,21 @@ class json_pointer
                         // "-" always fails the range check
                         return false;
                     }
-                    if (JSON_HEDLEY_UNLIKELY(reference_token.size() == 1 and not (reference_token >= "0" and reference_token <= "9")))
+                    if (JSON_HEDLEY_UNLIKELY(reference_token.size() == 1 and not ("0" <= reference_token and reference_token <= "9")))
                     {
                         // invalid char
                         return false;
                     }
                     if (JSON_HEDLEY_UNLIKELY(reference_token.size() > 1))
                     {
-                        if (JSON_HEDLEY_UNLIKELY(not (reference_token[0] > '0' and reference_token[0] <= '9')))
+                        if (JSON_HEDLEY_UNLIKELY(not ('1' <= reference_token[0] and reference_token[0] <= '9')))
                         {
                             // first char should be between '1' and '9'
                             return false;
                         }
                         for (std::size_t i = 1; i < reference_token.size(); i++)
                         {
-                            if (JSON_HEDLEY_UNLIKELY(not (reference_token[i] >= '0' and reference_token[i] <= '9')))
+                            if (JSON_HEDLEY_UNLIKELY(not ('0' <= reference_token[i] and reference_token[i] <= '9')))
                             {
                                 // other char should be between '0' and '9'
                                 return false;

single_include/nlohmann/json.hpp

@@ -11081,21 +11081,21 @@ class json_pointer
                         // "-" always fails the range check
                         return false;
                     }
-                    if (JSON_HEDLEY_UNLIKELY(reference_token.size() == 1 and not (reference_token >= "0" and reference_token <= "9")))
+                    if (JSON_HEDLEY_UNLIKELY(reference_token.size() == 1 and not ("0" <= reference_token and reference_token <= "9")))
                     {
                         // invalid char
                         return false;
                     }
                     if (JSON_HEDLEY_UNLIKELY(reference_token.size() > 1))
                     {
-                        if (JSON_HEDLEY_UNLIKELY(not (reference_token[0] > '0' and reference_token[0] <= '9')))
+                        if (JSON_HEDLEY_UNLIKELY(not ('1' <= reference_token[0] and reference_token[0] <= '9')))
                         {
                             // first char should be between '1' and '9'
                             return false;
                         }
                         for (std::size_t i = 1; i < reference_token.size(); i++)
                         {
-                            if (JSON_HEDLEY_UNLIKELY(not (reference_token[i] >= '0' and reference_token[i] <= '9')))
+                            if (JSON_HEDLEY_UNLIKELY(not ('0' <= reference_token[i] and reference_token[i] <= '9')))
                             {
                                 // other char should be between '0' and '9'
                                 return false;