Do not use total_ordering

pytoolbox/enum.py

@@ -15,11 +15,12 @@
 except ImportError:
     pass
 else:
-    import functools
-
-    @functools.total_ordering
     class OrderedEnum(enum.Enum):
-        """An enumeration both hash-able and ordered by value."""
+        """
+        An enumeration both hash-able and ordered by value.
+
+        Reference: https://docs.python.org/3/library/enum.html#orderedenum.
+        """
 
         def __hash__(self):
             return hash(self.value)
@@ -29,7 +30,27 @@ def __eq__(self, other):
                 return self.value == other.value
             return NotImplemented
 
+        def __ge__(self, other):
+            if self.__class__ is other.__class__:
+                return self.value >= other.value
+            return NotImplemented
+
+        def __gt__(self, other):
+            if self.__class__ is other.__class__:
+                return self.value > other.value
+            return NotImplemented
+
+        def __le__(self, other):
+            if self.__class__ is other.__class__:
+                return self.value <= other.value
+            return NotImplemented
+
         def __lt__(self, other):
             if self.__class__ is other.__class__:
                 return self.value < other.value
             return NotImplemented
+
+        def __ne__(self, other):
+            if self.__class__ is other.__class__:
+                return self.value != other.value
+            return NotImplemented