Fixed cloudpickle breaking

test/requirements.txt

@@ -2,3 +2,4 @@ equinox>=0.5.3
 pytest>=7.0.1
 beartype>=0.10.4
 typeguard>=2.13.3
+cloudpickle>=2.2.1

test/test_serialisation.py

@@ -0,0 +1,8 @@
+import cloudpickle
+
+from jaxtyping import AbstractArray, Array, Shaped
+
+
+def test_pickle():
+    cloudpickle.dumps(Shaped[Array, ""])
+    cloudpickle.dumps(AbstractArray)