Fix ctuple comparison.

Cython/Compiler/ExprNodes.py

@@ -10501,11 +10501,10 @@ class CmpNode(object):
 
         if new_common_type is None:
             # fall back to generic type compatibility tests
-            if type1 == type2:
-                if type1.is_ctuple:
-                    new_common_type = py_object_type
-                else:
-                    new_common_type = type1
+            if type1.is_ctuple or type2.is_ctuple:
+                new_common_type = py_object_type
+            elif type1 == type2:
+                new_common_type = type1
             elif type1.is_pyobject or type2.is_pyobject:
                 if type2.is_numeric or type2.is_string:
                     if operand2.check_for_coercion_error(type1, env):

tests/run/ctuple.pyx

@@ -120,6 +120,17 @@ def test_equality((int, int) ab, (int, int) cd, (int, int) ef):
     """
     return ab < cd <= ef
 
+def test_equality_different_types((double, int) ab, (int, int) cd, (long, int) ef):
+    """
+    >>> test_equality((1, 2), (3, 4), (5, 6))
+    True
+    >>> test_equality((1, 2), (3, 4), (3, 4))
+    True
+    >>> test_equality((3, 4), (3, 4), (3, 4))
+    False
+    """
+    return ab < cd <= ef
+
 def test_binop((int, int) ab, (double, double) cd):
     """
     >>> test_binop((1, 2), (3, 4))