diff --git a/test/runtest.py b/test/runtest.py
index ca5d42ef5..0c00923cd 100644
--- a/test/runtest.py
+++ b/test/runtest.py
@@ -15,7 +15,8 @@ RAY_TEST_OBJECTS = [[1, "hello", 3.0], 42, 43L, "hello world", 42.0, 1L << 62,
                     (1.0, "hi"), None, (None, None), ("hello", None),
                     True, False, (True, False), u"\u262F",
                     {True: "hello", False: "world"},
-                    {"hello" : "world", 1: 42, 1.0: 45}, {},
+                    {"hello" : "world", 1: 42, 1.0: 45}, {}, {(): ()},
+                    {(1, 2): 1}, {(): [1, 2, "hi"]}, (), [], [()], ((),),
                     np.int8(3), np.int32(4), np.int64(5),
                     np.uint8(3), np.uint32(4), np.uint64(5),
                     np.float32(1.0), np.float64(1.0)]
diff --git a/thirdparty/numbuf b/thirdparty/numbuf
index 7b548bddd..74406e92e 160000
--- a/thirdparty/numbuf
+++ b/thirdparty/numbuf
@@ -1 +1 @@
-Subproject commit 7b548bddd337f2358fdf4a042f12c917a29da40d
+Subproject commit 74406e92e4e10c228f2850e72ea835980c779e3b