Fix boolean all reduce bug (#1355)

python/tests/test_reduce.py

@@ -124,6 +124,13 @@ class TestReduce(mlx_tests.MLXTestCase):
         z = np.array(x).sum((0, 2, 3))
         self.assertTrue(np.all(z == y))
 
+    def test_sum_bool(self):
+        x = np.random.uniform(0, 1, size=(10, 10, 10)) > 0.5
+        y = mx.array(x)
+        npsum = x.sum().item()
+        mxsum = y.sum().item()
+        self.assertEqual(npsum, mxsum)
+
 
 if __name__ == "__main__":
     unittest.main(failfast=True)