Issue 2235: __hash__ is once again inherited by default, but inheritance can be blocked explicitly so that collections.Hashable remains meaningful
diff --git a/Lib/decimal.py b/Lib/decimal.py
index c94e1be..a545cf8 100644
--- a/Lib/decimal.py
+++ b/Lib/decimal.py
@@ -3697,10 +3697,8 @@
         for flag in flags:
             self._ignored_flags.remove(flag)
 
-    def __hash__(self):
-        """A Context cannot be hashed."""
-        # We inherit object.__hash__, so we must deny this explicitly
-        raise TypeError("Cannot hash a Context.")
+    # We inherit object.__hash__, so we must deny this explicitly
+    __hash__ = None
 
     def Etiny(self):
         """Returns Etiny (= Emin - prec + 1)"""