diff --git a/docs/main/changelog.rst b/docs/main/changelog.rst
index c9b2a2b0..b5b2b0dd 100644
--- a/docs/main/changelog.rst
+++ b/docs/main/changelog.rst
@@ -16,6 +16,8 @@ Development version
 - Fix a few typos in docs (thanks to `Bruno P. Kinoshita <https://github.com/kinow>`_,
   `issue #249 <https://github.com/ets-labs/python-dependency-injector/issues/249>`_,
   `PR #250 <https://github.com/ets-labs/python-dependency-injector/pull/250>`_).
+- Regenerate C sources using Cython 0.29.20.
+
 
 3.15.6
 ------
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 92f4c88a..e30132f5 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,4 +1,4 @@
-cython==0.29.14
+cython==0.29.20
 tox
 unittest2
 coverage
diff --git a/src/dependency_injector/containers.c b/src/dependency_injector/containers.c
index dff479ca..bdcf1a99 100644
--- a/src/dependency_injector/containers.c
+++ b/src/dependency_injector/containers.c
@@ -1,4 +1,4 @@
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+/* Generated by Cython 0.29.20 */
 
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 #include "Python.h"
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     #error Cython requires Python 2.6+ or Python 3.3+.
 #else
-#define CYTHON_ABI "0_29_14"
-#define CYTHON_HEX_VERSION 0x001D0EF0
+#define CYTHON_ABI "0_29_20"
+#define CYTHON_HEX_VERSION 0x001D14F0
 #define CYTHON_FUTURE_DIVISION 0
 #include <stddef.h>
 #ifndef offsetof
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   #define PyString_Type                PyUnicode_Type
   #define PyString_Check               PyUnicode_Check
   #define PyString_CheckExact          PyUnicode_CheckExact
+#ifndef PyObject_Unicode
   #define PyObject_Unicode             PyObject_Str
 #endif
+#endif
 #if PY_MAJOR_VERSION >= 3
   #define __Pyx_PyBaseString_Check(obj) PyUnicode_Check(obj)
   #define __Pyx_PyBaseString_CheckExact(obj) PyUnicode_CheckExact(obj)
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 #ifndef PySet_CheckExact
   #define PySet_CheckExact(obj)        (Py_TYPE(obj) == &PySet_Type)
 #endif
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+  #define __Pyx_SET_REFCNT(obj, refcnt) Py_SET_REFCNT(obj, refcnt)
+  #define __Pyx_SET_SIZE(obj, size) Py_SET_SIZE(obj, size)
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+  #define __Pyx_SET_REFCNT(obj, refcnt) Py_REFCNT(obj) = (refcnt)
+  #define __Pyx_SET_SIZE(obj, size) Py_SIZE(obj) = (size)
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 #if CYTHON_ASSUME_SAFE_MACROS
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@@ -576,11 +585,10 @@ static CYTHON_INLINE float __PYX_NAN() {
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-
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 #define __Pyx_CYFUNCTION_CLASSMETHOD   0x02
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+  __pyx_t_3 = __Pyx_CyFunction_New(&__pyx_mdef_19dependency_injector_10containers_20DeclarativeContainer_1__new__, __Pyx_CYFUNCTION_STATICMETHOD, __pyx_n_s_DeclarativeContainer___new, NULL, __pyx_n_s_dependency_injector_containers, __pyx_d, ((PyObject *)__pyx_codeobj__31)); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 293, __pyx_L1_error)
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+  __pyx_t_4 = __Pyx_CyFunction_New(&__pyx_mdef_19dependency_injector_10containers_20DeclarativeContainer_5reset_last_overriding, __Pyx_CYFUNCTION_CLASSMETHOD, __pyx_n_s_DeclarativeContainer_reset_last, NULL, __pyx_n_s_dependency_injector_containers, __pyx_d, ((PyObject *)__pyx_codeobj__35)); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 330, __pyx_L1_error)
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+  __pyx_t_3 = __Pyx_CyFunction_New(&__pyx_mdef_19dependency_injector_10containers_20DeclarativeContainer_7reset_override, __Pyx_CYFUNCTION_CLASSMETHOD, __pyx_n_s_DeclarativeContainer_reset_overr, NULL, __pyx_n_s_dependency_injector_containers, __pyx_d, ((PyObject *)__pyx_codeobj__37)); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 344, __pyx_L1_error)
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   /* "dependency_injector/containers.pyx":343
@@ -12121,7 +12293,7 @@ static int __Pyx_ParseOptionalKeywords(
         }
         name = first_kw_arg;
         #if PY_MAJOR_VERSION < 3
-        if (likely(PyString_CheckExact(key)) || likely(PyString_Check(key))) {
+        if (likely(PyString_Check(key))) {
             while (*name) {
                 if ((CYTHON_COMPILING_IN_PYPY || PyString_GET_SIZE(**name) == PyString_GET_SIZE(key))
                         && _PyString_Eq(**name, key)) {
@@ -12148,7 +12320,7 @@ static int __Pyx_ParseOptionalKeywords(
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                 #if !CYTHON_COMPILING_IN_PYPY && PY_MAJOR_VERSION >= 3
-                    (PyUnicode_GET_SIZE(**name) != PyUnicode_GET_SIZE(key)) ? 1 :
+                    (__Pyx_PyUnicode_GET_LENGTH(**name) != __Pyx_PyUnicode_GET_LENGTH(key)) ? 1 :
                 #endif
                     PyUnicode_Compare(**name, key);
                 if (cmp < 0 && unlikely(PyErr_Occurred())) goto bad;
@@ -12164,7 +12336,7 @@ static int __Pyx_ParseOptionalKeywords(
                 while (argname != first_kw_arg) {
                     int cmp = (**argname == key) ? 0 :
                     #if !CYTHON_COMPILING_IN_PYPY && PY_MAJOR_VERSION >= 3
-                        (PyUnicode_GET_SIZE(**argname) != PyUnicode_GET_SIZE(key)) ? 1 :
+                        (__Pyx_PyUnicode_GET_LENGTH(**argname) != __Pyx_PyUnicode_GET_LENGTH(key)) ? 1 :
                     #endif
                         PyUnicode_Compare(**argname, key);
                     if (cmp < 0 && unlikely(PyErr_Occurred())) goto bad;
@@ -12729,7 +12901,7 @@ bad:
     goto done;
 }
 
-/* CythonFunction */
+/* CythonFunctionShared */
 #include <structmember.h>
 static PyObject *
 __Pyx_CyFunction_get_doc(__pyx_CyFunctionObject *op, CYTHON_UNUSED void *closure)
@@ -13036,10 +13208,9 @@ static PyMethodDef __pyx_CyFunction_methods[] = {
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 #define __Pyx_CyFunction_weakreflist(cyfunc) ((cyfunc)->func.m_weakreflist)
 #endif
-static PyObject *__Pyx_CyFunction_New(PyTypeObject *type, PyMethodDef *ml, int flags, PyObject* qualname,
-                                      PyObject *closure, PyObject *module, PyObject* globals, PyObject* code) {
-    __pyx_CyFunctionObject *op = PyObject_GC_New(__pyx_CyFunctionObject, type);
-    if (op == NULL)
+static PyObject *__Pyx_CyFunction_Init(__pyx_CyFunctionObject *op, PyMethodDef *ml, int flags, PyObject* qualname,
+                                       PyObject *closure, PyObject *module, PyObject* globals, PyObject* code) {
+    if (unlikely(op == NULL))
         return NULL;
     op->flags = flags;
     __Pyx_CyFunction_weakreflist(op) = NULL;
@@ -13060,12 +13231,12 @@ static PyObject *__Pyx_CyFunction_New(PyTypeObject *type, PyMethodDef *ml, int f
     Py_XINCREF(code);
     op->func_code = code;
     op->defaults_pyobjects = 0;
+    op->defaults_size = 0;
     op->defaults = NULL;
     op->defaults_tuple = NULL;
     op->defaults_kwdict = NULL;
     op->defaults_getter = NULL;
     op->func_annotations = NULL;
-    PyObject_GC_Track(op);
     return (PyObject *) op;
 }
 static int
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         return PyErr_NoMemory();
     memset(m->defaults, 0, size);
     m->defaults_pyobjects = pyobjects;
+    m->defaults_size = size;
     return m->defaults;
 }
 static CYTHON_INLINE void __Pyx_CyFunction_SetDefaultsTuple(PyObject *func, PyObject *tuple) {
@@ -13331,6 +13503,19 @@ static CYTHON_INLINE void __Pyx_CyFunction_SetAnnotationsDict(PyObject *func, Py
     Py_INCREF(dict);
 }
 
+/* CythonFunction */
+static PyObject *__Pyx_CyFunction_New(PyMethodDef *ml, int flags, PyObject* qualname,
+                                      PyObject *closure, PyObject *module, PyObject* globals, PyObject* code) {
+    PyObject *op = __Pyx_CyFunction_Init(
+        PyObject_GC_New(__pyx_CyFunctionObject, __pyx_CyFunctionType),
+        ml, flags, qualname, closure, module, globals, code
+    );
+    if (likely(op)) {
+        PyObject_GC_Track(op);
+    }
+    return op;
+}
+
 /* GetAttr3 */
 static PyObject *__Pyx_GetAttr3Default(PyObject *d) {
     __Pyx_PyThreadState_declare
@@ -13539,7 +13724,7 @@ static PyObject *__Pyx_Import(PyObject *name, PyObject *from_list, int level) {
     {
         #if PY_MAJOR_VERSION >= 3
         if (level == -1) {
-            if (strchr(__Pyx_MODULE_NAME, '.')) {
+            if ((1) && (strchr(__Pyx_MODULE_NAME, '.'))) {
                 module = PyImport_ImportModuleLevelObject(
                     name, global_dict, empty_dict, list, 1);
                 if (!module) {
@@ -13704,6 +13889,7 @@ static PyObject* __Pyx_Method_ClassMethod(PyObject *method) {
 #if CYTHON_COMPILING_IN_PYSTON || CYTHON_COMPILING_IN_PYPY
     if (PyMethodDescr_Check(method))
 #else
+    #if PY_MAJOR_VERSION == 2
     static PyTypeObject *methoddescr_type = NULL;
     if (methoddescr_type == NULL) {
        PyObject *meth = PyObject_GetAttrString((PyObject*)&PyList_Type, "append");
@@ -13711,6 +13897,9 @@ static PyObject* __Pyx_Method_ClassMethod(PyObject *method) {
        methoddescr_type = Py_TYPE(meth);
        Py_DECREF(meth);
     }
+    #else
+    PyTypeObject *methoddescr_type = &PyMethodDescr_Type;
+    #endif
     if (__Pyx_TypeCheck(method, methoddescr_type))
 #endif
     {
@@ -13726,23 +13915,14 @@ static PyObject* __Pyx_Method_ClassMethod(PyObject *method) {
     else if (PyMethod_Check(method)) {
         return PyClassMethod_New(PyMethod_GET_FUNCTION(method));
     }
-    else if (PyCFunction_Check(method)) {
+    else {
         return PyClassMethod_New(method);
     }
-#ifdef __Pyx_CyFunction_USED
-    else if (__Pyx_CyFunction_Check(method)) {
-        return PyClassMethod_New(method);
-    }
-#endif
-    PyErr_SetString(PyExc_TypeError,
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-                   "a method_descriptor or instance method.");
-    return NULL;
 }
 
 /* CLineInTraceback */
 #ifndef CYTHON_CLINE_IN_TRACEBACK
-static int __Pyx_CLineForTraceback(PyThreadState *tstate, int c_line) {
+static int __Pyx_CLineForTraceback(CYTHON_NCP_UNUSED PyThreadState *tstate, int c_line) {
     PyObject *use_cline;
     PyObject *ptype, *pvalue, *ptraceback;
 #if CYTHON_COMPILING_IN_CPYTHON
@@ -13846,7 +14026,7 @@ static void __pyx_insert_code_object(int code_line, PyCodeObject* code_object) {
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         int new_max = __pyx_code_cache.max_count + 64;
         entries = (__Pyx_CodeObjectCacheEntry*)PyMem_Realloc(
-            __pyx_code_cache.entries, (size_t)new_max*sizeof(__Pyx_CodeObjectCacheEntry));
+            __pyx_code_cache.entries, ((size_t)new_max) * sizeof(__Pyx_CodeObjectCacheEntry));
         if (unlikely(!entries)) {
             return;
         }
diff --git a/src/dependency_injector/providers.c b/src/dependency_injector/providers.c
index a97c63ab..c0c8da67 100644
--- a/src/dependency_injector/providers.c
+++ b/src/dependency_injector/providers.c
@@ -1,4 +1,4 @@
-/* Generated by Cython 0.29.14 */
+/* Generated by Cython 0.29.20 */
 
 #define PY_SSIZE_T_CLEAN
 #include "Python.h"
@@ -7,8 +7,8 @@
 #elif PY_VERSION_HEX < 0x02060000 || (0x03000000 <= PY_VERSION_HEX && PY_VERSION_HEX < 0x03030000)
     #error Cython requires Python 2.6+ or Python 3.3+.
 #else
-#define CYTHON_ABI "0_29_14"
-#define CYTHON_HEX_VERSION 0x001D0EF0
+#define CYTHON_ABI "0_29_20"
+#define CYTHON_HEX_VERSION 0x001D14F0
 #define CYTHON_FUTURE_DIVISION 0
 #include <stddef.h>
 #ifndef offsetof
@@ -484,8 +484,10 @@ static CYTHON_INLINE void * PyThread_tss_get(Py_tss_t *key) {
   #define PyString_Type                PyUnicode_Type
   #define PyString_Check               PyUnicode_Check
   #define PyString_CheckExact          PyUnicode_CheckExact
+#ifndef PyObject_Unicode
   #define PyObject_Unicode             PyObject_Str
 #endif
+#endif
 #if PY_MAJOR_VERSION >= 3
   #define __Pyx_PyBaseString_Check(obj) PyUnicode_Check(obj)
   #define __Pyx_PyBaseString_CheckExact(obj) PyUnicode_CheckExact(obj)
@@ -496,6 +498,13 @@ static CYTHON_INLINE void * PyThread_tss_get(Py_tss_t *key) {
 #ifndef PySet_CheckExact
   #define PySet_CheckExact(obj)        (Py_TYPE(obj) == &PySet_Type)
 #endif
+#if PY_VERSION_HEX >= 0x030900A4
+  #define __Pyx_SET_REFCNT(obj, refcnt) Py_SET_REFCNT(obj, refcnt)
+  #define __Pyx_SET_SIZE(obj, size) Py_SET_SIZE(obj, size)
+#else
+  #define __Pyx_SET_REFCNT(obj, refcnt) Py_REFCNT(obj) = (refcnt)
+  #define __Pyx_SET_SIZE(obj, size) Py_SIZE(obj) = (size)
+#endif
 #if CYTHON_ASSUME_SAFE_MACROS
   #define __Pyx_PySequence_SIZE(seq)  Py_SIZE(seq)
 #else
@@ -576,11 +585,10 @@ static CYTHON_INLINE float __PYX_NAN() {
 #define __Pyx_truncl truncl
 #endif
 
-
+#define __PYX_MARK_ERR_POS(f_index, lineno) \
+    { __pyx_filename = __pyx_f[f_index]; (void)__pyx_filename; __pyx_lineno = lineno; (void)__pyx_lineno; __pyx_clineno = __LINE__; (void)__pyx_clineno; }
 #define __PYX_ERR(f_index, lineno, Ln_error) \
-{ \
-  __pyx_filename = __pyx_f[f_index]; __pyx_lineno = lineno; __pyx_clineno = __LINE__; goto Ln_error; \
-}
+    { __PYX_MARK_ERR_POS(f_index, lineno) goto Ln_error; }
 
 #ifndef __PYX_EXTERN_C
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         Py_INCREF(x);
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 static int __Pyx_modinit_function_export_code(void) {
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 static int __Pyx_modinit_type_init_code(void) {
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-#if PY_MAJOR_VERSION < 3
-#ifdef CYTHON_NO_PYINIT_EXPORT
-#define __Pyx_PyMODINIT_FUNC void
-#else
+#ifndef CYTHON_NO_PYINIT_EXPORT
 #define __Pyx_PyMODINIT_FUNC PyMODINIT_FUNC
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+#ifdef __cplusplus
+#define __Pyx_PyMODINIT_FUNC extern "C" void
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+#define __Pyx_PyMODINIT_FUNC void
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 #else
-#ifdef CYTHON_NO_PYINIT_EXPORT
-#define __Pyx_PyMODINIT_FUNC PyObject *
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+#define __Pyx_PyMODINIT_FUNC extern "C" PyObject *
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-#define __Pyx_PyMODINIT_FUNC PyMODINIT_FUNC
+#define __Pyx_PyMODINIT_FUNC PyObject *
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         name = first_kw_arg;
         #if PY_MAJOR_VERSION < 3
-        if (likely(PyString_CheckExact(key)) || likely(PyString_Check(key))) {
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                         && _PyString_Eq(**name, key)) {
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-                    (PyUnicode_GET_SIZE(**name) != PyUnicode_GET_SIZE(key)) ? 1 :
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-                        (PyUnicode_GET_SIZE(**argname) != PyUnicode_GET_SIZE(key)) ? 1 :
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         if (level == -1) {
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@@ -63181,6 +64367,28 @@ bad:
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 }
 
+/* PyObjectGetAttrStrNoError */
+static void __Pyx_PyObject_GetAttrStr_ClearAttributeError(void) {
+    __Pyx_PyThreadState_declare
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+        __Pyx_PyErr_Clear();
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+static CYTHON_INLINE PyObject* __Pyx_PyObject_GetAttrStrNoError(PyObject* obj, PyObject* attr_name) {
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 /* SetupReduce */
 static int __Pyx_setup_reduce_is_named(PyObject* meth, PyObject* name) {
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+    if (_PyType_Lookup((PyTypeObject*)type_obj, __pyx_n_s_getstate)) goto __PYX_GOOD;
 #else
-    if (PyObject_HasAttr(type_obj, __pyx_n_s_getstate)) goto GOOD;
+    if (PyObject_HasAttr(type_obj, __pyx_n_s_getstate)) goto __PYX_GOOD;
 #endif
 #if CYTHON_USE_PYTYPE_LOOKUP
-    object_reduce_ex = _PyType_Lookup(&PyBaseObject_Type, __pyx_n_s_reduce_ex); if (!object_reduce_ex) goto BAD;
+    object_reduce_ex = _PyType_Lookup(&PyBaseObject_Type, __pyx_n_s_reduce_ex); if (!object_reduce_ex) goto __PYX_BAD;
 #else
-    object_reduce_ex = __Pyx_PyObject_GetAttrStr((PyObject*)&PyBaseObject_Type, __pyx_n_s_reduce_ex); if (!object_reduce_ex) goto BAD;
+    object_reduce_ex = __Pyx_PyObject_GetAttrStr((PyObject*)&PyBaseObject_Type, __pyx_n_s_reduce_ex); if (!object_reduce_ex) goto __PYX_BAD;
 #endif
-    reduce_ex = __Pyx_PyObject_GetAttrStr(type_obj, __pyx_n_s_reduce_ex); if (unlikely(!reduce_ex)) goto BAD;
+    reduce_ex = __Pyx_PyObject_GetAttrStr(type_obj, __pyx_n_s_reduce_ex); if (unlikely(!reduce_ex)) goto __PYX_BAD;
     if (reduce_ex == object_reduce_ex) {
 #if CYTHON_USE_PYTYPE_LOOKUP
-        object_reduce = _PyType_Lookup(&PyBaseObject_Type, __pyx_n_s_reduce); if (!object_reduce) goto BAD;
+        object_reduce = _PyType_Lookup(&PyBaseObject_Type, __pyx_n_s_reduce); if (!object_reduce) goto __PYX_BAD;
 #else
-        object_reduce = __Pyx_PyObject_GetAttrStr((PyObject*)&PyBaseObject_Type, __pyx_n_s_reduce); if (!object_reduce) goto BAD;
+        object_reduce = __Pyx_PyObject_GetAttrStr((PyObject*)&PyBaseObject_Type, __pyx_n_s_reduce); if (!object_reduce) goto __PYX_BAD;
 #endif
-        reduce = __Pyx_PyObject_GetAttrStr(type_obj, __pyx_n_s_reduce); if (unlikely(!reduce)) goto BAD;
+        reduce = __Pyx_PyObject_GetAttrStr(type_obj, __pyx_n_s_reduce); if (unlikely(!reduce)) goto __PYX_BAD;
         if (reduce == object_reduce || __Pyx_setup_reduce_is_named(reduce, __pyx_n_s_reduce_cython)) {
-            reduce_cython = __Pyx_PyObject_GetAttrStr(type_obj, __pyx_n_s_reduce_cython); if (unlikely(!reduce_cython)) goto BAD;
-            ret = PyDict_SetItem(((PyTypeObject*)type_obj)->tp_dict, __pyx_n_s_reduce, reduce_cython); if (unlikely(ret < 0)) goto BAD;
-            ret = PyDict_DelItem(((PyTypeObject*)type_obj)->tp_dict, __pyx_n_s_reduce_cython); if (unlikely(ret < 0)) goto BAD;
+            reduce_cython = __Pyx_PyObject_GetAttrStrNoError(type_obj, __pyx_n_s_reduce_cython);
+            if (likely(reduce_cython)) {
+                ret = PyDict_SetItem(((PyTypeObject*)type_obj)->tp_dict, __pyx_n_s_reduce, reduce_cython); if (unlikely(ret < 0)) goto __PYX_BAD;
+                ret = PyDict_DelItem(((PyTypeObject*)type_obj)->tp_dict, __pyx_n_s_reduce_cython); if (unlikely(ret < 0)) goto __PYX_BAD;
+            } else if (reduce == object_reduce || PyErr_Occurred()) {
+                goto __PYX_BAD;
+            }
             setstate = __Pyx_PyObject_GetAttrStr(type_obj, __pyx_n_s_setstate);
             if (!setstate) PyErr_Clear();
             if (!setstate || __Pyx_setup_reduce_is_named(setstate, __pyx_n_s_setstate_cython)) {
-                setstate_cython = __Pyx_PyObject_GetAttrStr(type_obj, __pyx_n_s_setstate_cython); if (unlikely(!setstate_cython)) goto BAD;
-                ret = PyDict_SetItem(((PyTypeObject*)type_obj)->tp_dict, __pyx_n_s_setstate, setstate_cython); if (unlikely(ret < 0)) goto BAD;
-                ret = PyDict_DelItem(((PyTypeObject*)type_obj)->tp_dict, __pyx_n_s_setstate_cython); if (unlikely(ret < 0)) goto BAD;
+                setstate_cython = __Pyx_PyObject_GetAttrStrNoError(type_obj, __pyx_n_s_setstate_cython);
+                if (likely(setstate_cython)) {
+                    ret = PyDict_SetItem(((PyTypeObject*)type_obj)->tp_dict, __pyx_n_s_setstate, setstate_cython); if (unlikely(ret < 0)) goto __PYX_BAD;
+                    ret = PyDict_DelItem(((PyTypeObject*)type_obj)->tp_dict, __pyx_n_s_setstate_cython); if (unlikely(ret < 0)) goto __PYX_BAD;
+                } else if (!setstate || PyErr_Occurred()) {
+                    goto __PYX_BAD;
+                }
             }
             PyType_Modified((PyTypeObject*)type_obj);
         }
     }
-    goto GOOD;
-BAD:
+    goto __PYX_GOOD;
+__PYX_BAD:
     if (!PyErr_Occurred())
         PyErr_Format(PyExc_RuntimeError, "Unable to initialize pickling for %s", ((PyTypeObject*)type_obj)->tp_name);
     ret = -1;
-GOOD:
+__PYX_GOOD:
 #if !CYTHON_USE_PYTYPE_LOOKUP
     Py_XDECREF(object_reduce);
     Py_XDECREF(object_reduce_ex);
@@ -63511,7 +64727,7 @@ bad:
     goto done;
 }
 
-/* CythonFunction */
+/* CythonFunctionShared */
 #include <structmember.h>
 static PyObject *
 __Pyx_CyFunction_get_doc(__pyx_CyFunctionObject *op, CYTHON_UNUSED void *closure)
@@ -63818,10 +65034,9 @@ static PyMethodDef __pyx_CyFunction_methods[] = {
 #else
 #define __Pyx_CyFunction_weakreflist(cyfunc) ((cyfunc)->func.m_weakreflist)
 #endif
-static PyObject *__Pyx_CyFunction_New(PyTypeObject *type, PyMethodDef *ml, int flags, PyObject* qualname,
-                                      PyObject *closure, PyObject *module, PyObject* globals, PyObject* code) {
-    __pyx_CyFunctionObject *op = PyObject_GC_New(__pyx_CyFunctionObject, type);
-    if (op == NULL)
+static PyObject *__Pyx_CyFunction_Init(__pyx_CyFunctionObject *op, PyMethodDef *ml, int flags, PyObject* qualname,
+                                       PyObject *closure, PyObject *module, PyObject* globals, PyObject* code) {
+    if (unlikely(op == NULL))
         return NULL;
     op->flags = flags;
     __Pyx_CyFunction_weakreflist(op) = NULL;
@@ -63842,12 +65057,12 @@ static PyObject *__Pyx_CyFunction_New(PyTypeObject *type, PyMethodDef *ml, int f
     Py_XINCREF(code);
     op->func_code = code;
     op->defaults_pyobjects = 0;
+    op->defaults_size = 0;
     op->defaults = NULL;
     op->defaults_tuple = NULL;
     op->defaults_kwdict = NULL;
     op->defaults_getter = NULL;
     op->func_annotations = NULL;
-    PyObject_GC_Track(op);
     return (PyObject *) op;
 }
 static int
@@ -64095,6 +65310,7 @@ static CYTHON_INLINE void *__Pyx_CyFunction_InitDefaults(PyObject *func, size_t
         return PyErr_NoMemory();
     memset(m->defaults, 0, size);
     m->defaults_pyobjects = pyobjects;
+    m->defaults_size = size;
     return m->defaults;
 }
 static CYTHON_INLINE void __Pyx_CyFunction_SetDefaultsTuple(PyObject *func, PyObject *tuple) {
@@ -64113,9 +65329,22 @@ static CYTHON_INLINE void __Pyx_CyFunction_SetAnnotationsDict(PyObject *func, Py
     Py_INCREF(dict);
 }
 
+/* CythonFunction */
+static PyObject *__Pyx_CyFunction_New(PyMethodDef *ml, int flags, PyObject* qualname,
+                                      PyObject *closure, PyObject *module, PyObject* globals, PyObject* code) {
+    PyObject *op = __Pyx_CyFunction_Init(
+        PyObject_GC_New(__pyx_CyFunctionObject, __pyx_CyFunctionType),
+        ml, flags, qualname, closure, module, globals, code
+    );
+    if (likely(op)) {
+        PyObject_GC_Track(op);
+    }
+    return op;
+}
+
 /* CLineInTraceback */
 #ifndef CYTHON_CLINE_IN_TRACEBACK
-static int __Pyx_CLineForTraceback(PyThreadState *tstate, int c_line) {
+static int __Pyx_CLineForTraceback(CYTHON_NCP_UNUSED PyThreadState *tstate, int c_line) {
     PyObject *use_cline;
     PyObject *ptype, *pvalue, *ptraceback;
 #if CYTHON_COMPILING_IN_CPYTHON
@@ -64219,7 +65448,7 @@ static void __pyx_insert_code_object(int code_line, PyCodeObject* code_object) {
     if (__pyx_code_cache.count == __pyx_code_cache.max_count) {
         int new_max = __pyx_code_cache.max_count + 64;
         entries = (__Pyx_CodeObjectCacheEntry*)PyMem_Realloc(
-            __pyx_code_cache.entries, (size_t)new_max*sizeof(__Pyx_CodeObjectCacheEntry));
+            __pyx_code_cache.entries, ((size_t)new_max) * sizeof(__Pyx_CodeObjectCacheEntry));
         if (unlikely(!entries)) {
             return;
         }