Export int as hex for t8n and ?everywhere?

src/ethereum_test_base_types/base_types.py

@@ -58,7 +58,7 @@ def __str__(self) -> str:
         """
         Returns the string representation of the number.
         """
-        return str(int(self))
+        return str(hex(self))
 
     def hex(self) -> str:
         """