diff --git a/text.py b/text.py
index 37fab1b25..40a8d27b2 100644
--- a/text.py
+++ b/text.py
@@ -399,7 +399,6 @@ def actions(self, state):
 
     def result(self, state, action):
         new_state = hashabledict(state)  # copy to prevent hash issues
-        assert type(new_state) == hashabledict
         new_state[action[0]] = action[1]
         return new_state
 
diff --git a/utils.py b/utils.py
index 4d0c680cd..d738f62e6 100644
--- a/utils.py
+++ b/utils.py
@@ -579,19 +579,19 @@ def __hash__(self):
         return hash(self.__tuplify__())
 
     def __lt__(self, odict):
-        assert type(odict) is hashabledict
+        assert isinstance(odict, hashabledict)
         return self.__tuplify__() < odict.__tuplify__()
 
     def __gt__(self, odict):
-        assert type(odict) is hashabledict
+        assert isinstance(odict, hashabledict)
         return self.__tuplify__() > odict.__tuplify__()
 
     def __le__(self, odict):
-        assert type(odict) is hashabledict
+        assert isinstance(odict, hashabledict)
         return self.__tuplify__() <= odict.__tuplify__()
 
     def __ge__(self, odict):
-        assert type(odict) is hashabledict
+        assert isinstance(odict, hashabledict)
         return self.__tuplify__() >= odict.__tuplify__()