Merge branch '0.29.x'

CHANGES.rst

@@ -396,7 +396,7 @@ Other changes
 * Support for Python 2.6 was removed.
 
 
-0.29.18 (2020-0?-??)
+0.29.18 (2020-05-18)
 ====================
 
 Bugs fixed

Cython/Shadow.py

@@ -165,13 +165,13 @@ def cmod(a, b):
 def cast(t, *args, **kwargs):
     kwargs.pop('typecheck', None)
     assert not kwargs
-   
+
     if isinstance(t, typedef):
         return t(*args)
     elif isinstance(t, type): #Doesn't work with old-style classes of Python 2.x
         if len(args) != 1 or not (args[0] is None or isinstance(args[0], t)):
             return t(*args)
-            
+
     return args[0]
 
 def sizeof(arg):
@@ -187,7 +187,7 @@ def address(arg):
 def _is_value_type(t):
     if isinstance(t, typedef):
         return _is_value_type(t._basetype)
-        
+
     return isinstance(t, type) and issubclass(t, (StructType, UnionType, ArrayType))
 
 def declare(t=None, value=_Unspecified, **kwds):

Cython/Utility/ExtensionTypes.c

@@ -57,6 +57,7 @@ static int __Pyx_PyType_Ready(PyTypeObject *t) {
 #if PY_VERSION_HEX >= 0x03050000
     {
         // Make sure GC does not pick up our non-heap type as heap type with this hack!
+        // For details, see https://github.com/cython/cython/issues/3603
         PyObject *ret, *py_status;
         int gc_was_enabled;
         PyObject *gc = PyImport_Import(PYUNICODE("gc"));