Use "!" instead of the less clear "== 0" when testing for type features.

Cython/Compiler/ModuleNode.py

@@ -1454,7 +1454,7 @@ class ModuleNode(Nodes.Node, Nodes.BlockNode):
                 if is_final_type:
                     type_safety_check = ''
                 else:
-                    type_safety_check = ' & (__Pyx_PyType_HasFeature(t, (Py_TPFLAGS_IS_ABSTRACT | Py_TPFLAGS_HEAPTYPE)) == 0)'
+                    type_safety_check = ' & (!__Pyx_PyType_HasFeature(t, (Py_TPFLAGS_IS_ABSTRACT | Py_TPFLAGS_HEAPTYPE)))'
                 obj_struct = type.declaration_code("", deref=True)
                 code.putln(
                     "if (CYTHON_COMPILING_IN_CPYTHON && likely((%s > 0) & (t->tp_basicsize == sizeof(%s))%s)) {" % (
@@ -1467,7 +1467,7 @@ class ModuleNode(Nodes.Node, Nodes.BlockNode):
                     code.putln("PyObject_GC_Track(o);")
                 code.putln("} else {")
             if not is_final_type:
-                code.putln("if (likely(__Pyx_PyType_HasFeature(t, Py_TPFLAGS_IS_ABSTRACT) == 0)) {")
+                code.putln("if (likely(!__Pyx_PyType_HasFeature(t, Py_TPFLAGS_IS_ABSTRACT))) {")
             code.putln("o = (*t->tp_alloc)(t, 0);")
             if not is_final_type:
                 code.putln("} else {")
@@ -1660,7 +1660,7 @@ class ModuleNode(Nodes.Node, Nodes.BlockNode):
                     type_safety_check = ''
                 else:
                     type_safety_check = (
-                        ' & (__Pyx_PyType_HasFeature(Py_TYPE(o), (Py_TPFLAGS_IS_ABSTRACT | Py_TPFLAGS_HEAPTYPE)) == 0)')
+                        ' & (!__Pyx_PyType_HasFeature(Py_TYPE(o), (Py_TPFLAGS_IS_ABSTRACT | Py_TPFLAGS_HEAPTYPE)))')
 
                 type = scope.parent_type
                 code.putln(