Avoid assert_array_equal on PRNG keys.

This operates via conversion to np.array, which will soon be disallowed
by jax-ml/jax#24481.

Author: jakevdp

tests/core/core_lift_test.py

@@ -12,8 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import operator
-
 import jax
 import numpy as np
 from absl.testing import absltest
@@ -170,12 +168,11 @@ def body_fn(scope, c):
     )
     self.assertEqual(vars['state']['acc'], x)
     self.assertEqual(c, 2 * x)
-    np.testing.assert_array_equal(
+    self.assertEqual(
       vars['state']['rng_params'][0], vars['state']['rng_params'][1]
     )
     with jax.debug_key_reuse(False):
-      np.testing.assert_array_compare(
-        operator.__ne__,
+      self.assertNotEqual(
         vars['state']['rng_loop'][0],
         vars['state']['rng_loop'][1],
       )