diff --git a/arraycontext/container/traversal.py b/arraycontext/container/traversal.py
index b59fe79451e4f0f702c61dc65bc044653232b4e7..5a4dcf745282a0a1e07304a2ddcbebc5d9dac8f6 100644
--- a/arraycontext/container/traversal.py
+++ b/arraycontext/container/traversal.py
@@ -965,7 +965,7 @@ def outer(a: Any, b: Any) -> Any:
     elif isinstance(a, np.ndarray) or isinstance(b, np.ndarray):
         return map_array_container(lambda x: outer(x, b), a)
     else:
-        if type(a) != type(b):
+        if type(a) is not type(b):
             raise TypeError(
                 "both arguments must have the same type if they are both "
                 "non-object-array array containers.")
diff --git a/arraycontext/impl/jax/fake_numpy.py b/arraycontext/impl/jax/fake_numpy.py
index 095582088fb3ed50342d2e1a6748562421d360dd..27799cfebcd0e836ebc00f659aa80762b0203cde 100644
--- a/arraycontext/impl/jax/fake_numpy.py
+++ b/arraycontext/impl/jax/fake_numpy.py
@@ -159,7 +159,7 @@ class EagerJAXFakeNumpyNamespace(BaseFakeNumpyNamespace):
         false = actx.from_numpy(np.int8(False))
 
         def rec_equal(x, y):
-            if type(x) != type(y):
+            if type(x) is not type(y):
                 return false
 
             try:
diff --git a/arraycontext/impl/pyopencl/fake_numpy.py b/arraycontext/impl/pyopencl/fake_numpy.py
index d989d45acb83f1ee90ff0cd6559af762c553c4d1..a379f29006d6d66270872e894169f13f153d8e5f 100644
--- a/arraycontext/impl/pyopencl/fake_numpy.py
+++ b/arraycontext/impl/pyopencl/fake_numpy.py
@@ -212,7 +212,7 @@ class PyOpenCLFakeNumpyNamespace(LoopyBasedFakeNumpyNamespace):
         false = actx.from_numpy(np.int8(False))
 
         def rec_equal(x, y):
-            if type(x) != type(y):
+            if type(x) is not type(y):
                 return false
 
             try:
diff --git a/arraycontext/impl/pytato/fake_numpy.py b/arraycontext/impl/pytato/fake_numpy.py
index 14d9a968c83f4fc03a5de759665a79ce008e9347..6c78d4195684f722b56eb8cc83623af14841567b 100644
--- a/arraycontext/impl/pytato/fake_numpy.py
+++ b/arraycontext/impl/pytato/fake_numpy.py
@@ -167,7 +167,7 @@ class PytatoFakeNumpyNamespace(LoopyBasedFakeNumpyNamespace):
         false = actx.from_numpy(np.int8(False))
 
         def rec_equal(x, y):
-            if type(x) != type(y):
+            if type(x) is not type(y):
                 return false
 
             try: