diff --git a/Include/abstract.h b/Include/abstract.h
index 85550a3..79002a7 100644
--- a/Include/abstract.h
+++ b/Include/abstract.h
@@ -138,9 +138,6 @@
 #ifdef PY_SSIZE_T_CLEAN
 #  define PyObject_CallFunction _PyObject_CallFunction_SizeT
 #  define PyObject_CallMethod _PyObject_CallMethod_SizeT
-#  ifndef Py_LIMITED_API
-#    define _PyObject_CallMethodId _PyObject_CallMethodId_SizeT
-#  endif /* !Py_LIMITED_API */
 #endif
 
 
@@ -155,123 +152,6 @@
 PyAPI_FUNC(PyObject *) PyObject_Call(PyObject *callable,
                                      PyObject *args, PyObject *kwargs);
 
-#ifndef Py_LIMITED_API
-PyAPI_FUNC(PyObject*) _PyStack_AsTuple(
-    PyObject *const *stack,
-    Py_ssize_t nargs);
-
-PyAPI_FUNC(PyObject*) _PyStack_AsTupleSlice(
-    PyObject *const *stack,
-    Py_ssize_t nargs,
-    Py_ssize_t start,
-    Py_ssize_t end);
-
-/* Convert keyword arguments from the FASTCALL (stack: C array, kwnames: tuple)
-   format to a Python dictionary ("kwargs" dict).
-
-   The type of kwnames keys is not checked. The final function getting
-   arguments is responsible to check if all keys are strings, for example using
-   PyArg_ParseTupleAndKeywords() or PyArg_ValidateKeywordArguments().
-
-   Duplicate keys are merged using the last value. If duplicate keys must raise
-   an exception, the caller is responsible to implement an explicit keys on
-   kwnames. */
-PyAPI_FUNC(PyObject *) _PyStack_AsDict(
-    PyObject *const *values,
-    PyObject *kwnames);
-
-/* Convert (args, nargs, kwargs: dict) into a (stack, nargs, kwnames: tuple).
-
-   Return 0 on success, raise an exception and return -1 on error.
-
-   Write the new stack into *p_stack. If *p_stack is differen than args, it
-   must be released by PyMem_Free().
-
-   The stack uses borrowed references.
-
-   The type of keyword keys is not checked, these checks should be done
-   later (ex: _PyArg_ParseStackAndKeywords). */
-PyAPI_FUNC(int) _PyStack_UnpackDict(
-    PyObject *const *args,
-    Py_ssize_t nargs,
-    PyObject *kwargs,
-    PyObject *const **p_stack,
-    PyObject **p_kwnames);
-
-/* Suggested size (number of positional arguments) for arrays of PyObject*
-   allocated on a C stack to avoid allocating memory on the heap memory. Such
-   array is used to pass positional arguments to call functions of the
-   _PyObject_FastCall() family.
-
-   The size is chosen to not abuse the C stack and so limit the risk of stack
-   overflow. The size is also chosen to allow using the small stack for most
-   function calls of the Python standard library. On 64-bit CPU, it allocates
-   40 bytes on the stack. */
-#define _PY_FASTCALL_SMALL_STACK 5
-
-/* Return 1 if callable supports FASTCALL calling convention for positional
-   arguments: see _PyObject_FastCallDict() and _PyObject_FastCallKeywords() */
-PyAPI_FUNC(int) _PyObject_HasFastCall(PyObject *callable);
-
-/* Call the callable object 'callable' with the "fast call" calling convention:
-   args is a C array for positional arguments (nargs is the number of
-   positional arguments), kwargs is a dictionary for keyword arguments.
-
-   If nargs is equal to zero, args can be NULL. kwargs can be NULL.
-   nargs must be greater or equal to zero.
-
-   Return the result on success. Raise an exception on return NULL on
-   error. */
-PyAPI_FUNC(PyObject *) _PyObject_FastCallDict(
-    PyObject *callable,
-    PyObject *const *args,
-    Py_ssize_t nargs,
-    PyObject *kwargs);
-
-/* Call the callable object 'callable' with the "fast call" calling convention:
-   args is a C array for positional arguments followed by values of
-   keyword arguments. Keys of keyword arguments are stored as a tuple
-   of strings in kwnames. nargs is the number of positional parameters at
-   the beginning of stack. The size of kwnames gives the number of keyword
-   values in the stack after positional arguments.
-
-   kwnames must only contains str strings, no subclass, and all keys must
-   be unique.
-
-   If nargs is equal to zero and there is no keyword argument (kwnames is
-   NULL or its size is zero), args can be NULL.
-
-   Return the result on success. Raise an exception and return NULL on
-   error. */
-PyAPI_FUNC(PyObject *) _PyObject_FastCallKeywords(
-    PyObject *callable,
-    PyObject *const *args,
-    Py_ssize_t nargs,
-    PyObject *kwnames);
-
-#define _PyObject_FastCall(func, args, nargs) \
-    _PyObject_FastCallDict((func), (args), (nargs), NULL)
-
-#define _PyObject_CallNoArg(func) \
-    _PyObject_FastCallDict((func), NULL, 0, NULL)
-
-PyAPI_FUNC(PyObject *) _PyObject_Call_Prepend(
-    PyObject *callable,
-    PyObject *obj,
-    PyObject *args,
-    PyObject *kwargs);
-
-PyAPI_FUNC(PyObject *) _PyObject_FastCall_Prepend(
-    PyObject *callable,
-    PyObject *obj,
-    PyObject *const *args,
-    Py_ssize_t nargs);
-
-PyAPI_FUNC(PyObject *) _Py_CheckFunctionResult(PyObject *callable,
-                                               PyObject *result,
-                                               const char *where);
-#endif   /* Py_LIMITED_API */
-
 
 /* Call a callable Python object 'callable', with arguments given by the
    tuple 'args'.  If no arguments are needed, then 'args' can be *NULL*.
@@ -309,14 +189,6 @@
                                            const char *name,
                                            const char *format, ...);
 
-#ifndef Py_LIMITED_API
-/* Like PyObject_CallMethod(), but expect a _Py_Identifier*
-   as the method name. */
-PyAPI_FUNC(PyObject *) _PyObject_CallMethodId(PyObject *obj,
-                                              _Py_Identifier *name,
-                                              const char *format, ...);
-#endif /* !Py_LIMITED_API */
-
 PyAPI_FUNC(PyObject *) _PyObject_CallFunction_SizeT(PyObject *callable,
                                                     const char *format,
                                                     ...);
@@ -326,13 +198,6 @@
                                                   const char *format,
                                                   ...);
 
-#ifndef Py_LIMITED_API
-PyAPI_FUNC(PyObject *) _PyObject_CallMethodId_SizeT(PyObject *obj,
-                                                    _Py_Identifier *name,
-                                                    const char *format,
-                                                    ...);
-#endif /* !Py_LIMITED_API */
-
 /* Call a callable Python object 'callable' with a variable number of C
    arguments. The C arguments are provided as PyObject* values, terminated
    by a NULL.
@@ -357,13 +222,6 @@
     PyObject *name,
     ...);
 
-#ifndef Py_LIMITED_API
-PyAPI_FUNC(PyObject *) _PyObject_CallMethodIdObjArgs(
-    PyObject *obj,
-    struct _Py_Identifier *name,
-    ...);
-#endif /* !Py_LIMITED_API */
-
 
 /* Implemented elsewhere:
 
@@ -418,16 +276,6 @@
 PyAPI_FUNC(Py_ssize_t) PyObject_Length(PyObject *o);
 #define PyObject_Length PyObject_Size
 
-
-#ifndef Py_LIMITED_API
-PyAPI_FUNC(int) _PyObject_HasLen(PyObject *o);
-
-/* Guess the size of object 'o' using len(o) or o.__length_hint__().
-   If neither of those return a non-negative value, then return the default
-   value.  If one of the calls fails, this function returns -1. */
-PyAPI_FUNC(Py_ssize_t) PyObject_LengthHint(PyObject *o, Py_ssize_t);
-#endif
-
 /* Return element of 'o' corresponding to the object 'key'. Return NULL
   on failure.
 
@@ -505,78 +353,6 @@
 
 /* === New Buffer API ============================================ */
 
-#ifndef Py_LIMITED_API
-
-/* Return 1 if the getbuffer function is available, otherwise return 0. */
-#define PyObject_CheckBuffer(obj) \
-    (((obj)->ob_type->tp_as_buffer != NULL) &&  \
-     ((obj)->ob_type->tp_as_buffer->bf_getbuffer != NULL))
-
-/* This is a C-API version of the getbuffer function call.  It checks
-   to make sure object has the required function pointer and issues the
-   call.
-
-   Returns -1 and raises an error on failure and returns 0 on success. */
-PyAPI_FUNC(int) PyObject_GetBuffer(PyObject *obj, Py_buffer *view,
-                                   int flags);
-
-/* Get the memory area pointed to by the indices for the buffer given.
-   Note that view->ndim is the assumed size of indices. */
-PyAPI_FUNC(void *) PyBuffer_GetPointer(Py_buffer *view, Py_ssize_t *indices);
-
-/* Return the implied itemsize of the data-format area from a
-   struct-style description. */
-PyAPI_FUNC(int) PyBuffer_SizeFromFormat(const char *);
-
-/* Implementation in memoryobject.c */
-PyAPI_FUNC(int) PyBuffer_ToContiguous(void *buf, Py_buffer *view,
-                                      Py_ssize_t len, char order);
-
-PyAPI_FUNC(int) PyBuffer_FromContiguous(Py_buffer *view, void *buf,
-                                        Py_ssize_t len, char order);
-
-/* Copy len bytes of data from the contiguous chunk of memory
-   pointed to by buf into the buffer exported by obj.  Return
-   0 on success and return -1 and raise a PyBuffer_Error on
-   error (i.e. the object does not have a buffer interface or
-   it is not working).
-
-   If fort is 'F', then if the object is multi-dimensional,
-   then the data will be copied into the array in
-   Fortran-style (first dimension varies the fastest).  If
-   fort is 'C', then the data will be copied into the array
-   in C-style (last dimension varies the fastest).  If fort
-   is 'A', then it does not matter and the copy will be made
-   in whatever way is more efficient. */
-PyAPI_FUNC(int) PyObject_CopyData(PyObject *dest, PyObject *src);
-
-/* Copy the data from the src buffer to the buffer of destination. */
-PyAPI_FUNC(int) PyBuffer_IsContiguous(const Py_buffer *view, char fort);
-
-/*Fill the strides array with byte-strides of a contiguous
-  (Fortran-style if fort is 'F' or C-style otherwise)
-  array of the given shape with the given number of bytes
-  per element. */
-PyAPI_FUNC(void) PyBuffer_FillContiguousStrides(int ndims,
-                                               Py_ssize_t *shape,
-                                               Py_ssize_t *strides,
-                                               int itemsize,
-                                               char fort);
-
-/* Fills in a buffer-info structure correctly for an exporter
-   that can only share a contiguous chunk of memory of
-   "unsigned bytes" of the given length.
-
-   Returns 0 on success and -1 (with raising an error) on error. */
-PyAPI_FUNC(int) PyBuffer_FillInfo(Py_buffer *view, PyObject *o, void *buf,
-                                  Py_ssize_t len, int readonly,
-                                  int flags);
-
-/* Releases a Py_buffer obtained from getbuffer ParseTuple's "s*". */
-PyAPI_FUNC(void) PyBuffer_Release(Py_buffer *view);
-
-#endif /* Py_LIMITED_API */
-
 /* Takes an arbitrary object and returns the result of calling
    obj.__format__(format_spec). */
 PyAPI_FUNC(PyObject *) PyObject_Format(PyObject *obj,
@@ -594,11 +370,6 @@
 
    This function always succeeds. */
 PyAPI_FUNC(int) PyIter_Check(PyObject *);
-#ifndef Py_LIMITED_API
-#define PyIter_Check(obj) \
-    ((obj)->ob_type->tp_iternext != NULL && \
-     (obj)->ob_type->tp_iternext != &_PyObject_NextNotImplemented)
-#endif
 
 /* Takes an iterator object and calls its tp_iternext slot,
    returning the next value.
@@ -719,11 +490,6 @@
 /* Returns 1 if obj is an index integer (has the nb_index slot of the
    tp_as_number structure filled in), and 0 otherwise. */
 PyAPI_FUNC(int) PyIndex_Check(PyObject *);
-#ifndef Py_LIMITED_API
-#define PyIndex_Check(obj)                              \
-    ((obj)->ob_type->tp_as_number != NULL &&            \
-     (obj)->ob_type->tp_as_number->nb_index != NULL)
-#endif
 
 /* Returns the object 'o' converted to a Python int, or NULL with an exception
    raised on failure. */
@@ -930,13 +696,6 @@
 #define PySequence_Fast_GET_ITEM(o, i)\
      (PyList_Check(o) ? PyList_GET_ITEM(o, i) : PyTuple_GET_ITEM(o, i))
 
-/* Assume tp_as_sequence and sq_item exist and that 'i' does not
-   need to be corrected for a negative index. */
-#ifndef Py_LIMITED_API
-#define PySequence_ITEM(o, i)\
-    ( Py_TYPE(o)->tp_as_sequence->sq_item(o, i) )
-#endif
-
 /* Return a pointer to the underlying item array for
    an object retured by PySequence_Fast */
 #define PySequence_Fast_ITEMS(sf) \
@@ -956,27 +715,6 @@
    Use __contains__ if possible, else _PySequence_IterSearch(). */
 PyAPI_FUNC(int) PySequence_Contains(PyObject *seq, PyObject *ob);
 
-#ifndef Py_LIMITED_API
-#define PY_ITERSEARCH_COUNT    1
-#define PY_ITERSEARCH_INDEX    2
-#define PY_ITERSEARCH_CONTAINS 3
-
-/* Iterate over seq.
-
-   Result depends on the operation:
-
-   PY_ITERSEARCH_COUNT:  return # of times obj appears in seq; -1 if
-     error.
-   PY_ITERSEARCH_INDEX:  return 0-based index of first occurrence of
-     obj in seq; set ValueError and return -1 if none found;
-     also return -1 on error.
-   PY_ITERSEARCH_CONTAINS:  return 1 if obj in seq, else 0; -1 on
-     error. */
-PyAPI_FUNC(Py_ssize_t) _PySequence_IterSearch(PyObject *seq,
-                                              PyObject *obj, int operation);
-#endif
-
-
 /* For DLL-level backwards compatibility */
 #undef PySequence_In
 /* Determine if the sequence 'o' contains 'value'. If an item in 'o' is equal
@@ -1095,26 +833,11 @@
 /* issubclass(object, typeorclass) */
 PyAPI_FUNC(int) PyObject_IsSubclass(PyObject *object, PyObject *typeorclass);
 
-
 #ifndef Py_LIMITED_API
-PyAPI_FUNC(int) _PyObject_RealIsInstance(PyObject *inst, PyObject *cls);
-
-PyAPI_FUNC(int) _PyObject_RealIsSubclass(PyObject *derived, PyObject *cls);
-
-PyAPI_FUNC(char *const *) _PySequence_BytesToCharpArray(PyObject* self);
-
-PyAPI_FUNC(void) _Py_FreeCharPArray(char *const array[]);
-
-/* For internal use by buffer API functions */
-PyAPI_FUNC(void) _Py_add_one_to_index_F(int nd, Py_ssize_t *index,
-                                        const Py_ssize_t *shape);
-PyAPI_FUNC(void) _Py_add_one_to_index_C(int nd, Py_ssize_t *index,
-                                        const Py_ssize_t *shape);
-
-/* Convert Python int to Py_ssize_t. Do nothing if the argument is None. */
-PyAPI_FUNC(int) _Py_convert_optional_to_ssize_t(PyObject *, void *);
-#endif /* !Py_LIMITED_API */
-
+#  define Py_CPYTHON_ABSTRACTOBJECT_H
+#  include  "cpython/abstract.h"
+#  undef Py_CPYTHON_ABSTRACTOBJECT_H
+#endif
 
 #ifdef __cplusplus
 }
diff --git a/Include/cpython/abstract.h b/Include/cpython/abstract.h
new file mode 100644
index 0000000..0e00265
--- /dev/null
+++ b/Include/cpython/abstract.h
@@ -0,0 +1,281 @@
+#ifndef Py_CPYTHON_ABSTRACTOBJECT_H
+#  error "this header file must not be included directly"
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* === Object Protocol ================================================== */
+
+#ifdef PY_SSIZE_T_CLEAN
+#  define _PyObject_CallMethodId _PyObject_CallMethodId_SizeT
+#endif
+
+PyAPI_FUNC(PyObject*) _PyStack_AsTuple(
+    PyObject *const *stack,
+    Py_ssize_t nargs);
+
+PyAPI_FUNC(PyObject*) _PyStack_AsTupleSlice(
+    PyObject *const *stack,
+    Py_ssize_t nargs,
+    Py_ssize_t start,
+    Py_ssize_t end);
+
+/* Convert keyword arguments from the FASTCALL (stack: C array, kwnames: tuple)
+   format to a Python dictionary ("kwargs" dict).
+
+   The type of kwnames keys is not checked. The final function getting
+   arguments is responsible to check if all keys are strings, for example using
+   PyArg_ParseTupleAndKeywords() or PyArg_ValidateKeywordArguments().
+
+   Duplicate keys are merged using the last value. If duplicate keys must raise
+   an exception, the caller is responsible to implement an explicit keys on
+   kwnames. */
+PyAPI_FUNC(PyObject *) _PyStack_AsDict(
+    PyObject *const *values,
+    PyObject *kwnames);
+
+/* Convert (args, nargs, kwargs: dict) into a (stack, nargs, kwnames: tuple).
+
+   Return 0 on success, raise an exception and return -1 on error.
+
+   Write the new stack into *p_stack. If *p_stack is differen than args, it
+   must be released by PyMem_Free().
+
+   The stack uses borrowed references.
+
+   The type of keyword keys is not checked, these checks should be done
+   later (ex: _PyArg_ParseStackAndKeywords). */
+PyAPI_FUNC(int) _PyStack_UnpackDict(
+    PyObject *const *args,
+    Py_ssize_t nargs,
+    PyObject *kwargs,
+    PyObject *const **p_stack,
+    PyObject **p_kwnames);
+
+/* Suggested size (number of positional arguments) for arrays of PyObject*
+   allocated on a C stack to avoid allocating memory on the heap memory. Such
+   array is used to pass positional arguments to call functions of the
+   _PyObject_FastCall() family.
+
+   The size is chosen to not abuse the C stack and so limit the risk of stack
+   overflow. The size is also chosen to allow using the small stack for most
+   function calls of the Python standard library. On 64-bit CPU, it allocates
+   40 bytes on the stack. */
+#define _PY_FASTCALL_SMALL_STACK 5
+
+/* Return 1 if callable supports FASTCALL calling convention for positional
+   arguments: see _PyObject_FastCallDict() and _PyObject_FastCallKeywords() */
+PyAPI_FUNC(int) _PyObject_HasFastCall(PyObject *callable);
+
+/* Call the callable object 'callable' with the "fast call" calling convention:
+   args is a C array for positional arguments (nargs is the number of
+   positional arguments), kwargs is a dictionary for keyword arguments.
+
+   If nargs is equal to zero, args can be NULL. kwargs can be NULL.
+   nargs must be greater or equal to zero.
+
+   Return the result on success. Raise an exception on return NULL on
+   error. */
+PyAPI_FUNC(PyObject *) _PyObject_FastCallDict(
+    PyObject *callable,
+    PyObject *const *args,
+    Py_ssize_t nargs,
+    PyObject *kwargs);
+
+/* Call the callable object 'callable' with the "fast call" calling convention:
+   args is a C array for positional arguments followed by values of
+   keyword arguments. Keys of keyword arguments are stored as a tuple
+   of strings in kwnames. nargs is the number of positional parameters at
+   the beginning of stack. The size of kwnames gives the number of keyword
+   values in the stack after positional arguments.
+
+   kwnames must only contains str strings, no subclass, and all keys must
+   be unique.
+
+   If nargs is equal to zero and there is no keyword argument (kwnames is
+   NULL or its size is zero), args can be NULL.
+
+   Return the result on success. Raise an exception and return NULL on
+   error. */
+PyAPI_FUNC(PyObject *) _PyObject_FastCallKeywords(
+    PyObject *callable,
+    PyObject *const *args,
+    Py_ssize_t nargs,
+    PyObject *kwnames);
+
+#define _PyObject_FastCall(func, args, nargs) \
+    _PyObject_FastCallDict((func), (args), (nargs), NULL)
+
+#define _PyObject_CallNoArg(func) \
+    _PyObject_FastCallDict((func), NULL, 0, NULL)
+
+PyAPI_FUNC(PyObject *) _PyObject_Call_Prepend(
+    PyObject *callable,
+    PyObject *obj,
+    PyObject *args,
+    PyObject *kwargs);
+
+PyAPI_FUNC(PyObject *) _PyObject_FastCall_Prepend(
+    PyObject *callable,
+    PyObject *obj,
+    PyObject *const *args,
+    Py_ssize_t nargs);
+
+PyAPI_FUNC(PyObject *) _Py_CheckFunctionResult(PyObject *callable,
+                                               PyObject *result,
+                                               const char *where);
+
+/* Like PyObject_CallMethod(), but expect a _Py_Identifier*
+   as the method name. */
+PyAPI_FUNC(PyObject *) _PyObject_CallMethodId(PyObject *obj,
+                                              _Py_Identifier *name,
+                                              const char *format, ...);
+
+PyAPI_FUNC(PyObject *) _PyObject_CallMethodId_SizeT(PyObject *obj,
+                                                    _Py_Identifier *name,
+                                                    const char *format,
+                                                    ...);
+
+PyAPI_FUNC(PyObject *) _PyObject_CallMethodIdObjArgs(
+    PyObject *obj,
+    struct _Py_Identifier *name,
+    ...);
+
+PyAPI_FUNC(int) _PyObject_HasLen(PyObject *o);
+
+/* Guess the size of object 'o' using len(o) or o.__length_hint__().
+   If neither of those return a non-negative value, then return the default
+   value.  If one of the calls fails, this function returns -1. */
+PyAPI_FUNC(Py_ssize_t) PyObject_LengthHint(PyObject *o, Py_ssize_t);
+
+/* === New Buffer API ============================================ */
+
+/* Return 1 if the getbuffer function is available, otherwise return 0. */
+#define PyObject_CheckBuffer(obj) \
+    (((obj)->ob_type->tp_as_buffer != NULL) &&  \
+     ((obj)->ob_type->tp_as_buffer->bf_getbuffer != NULL))
+
+/* This is a C-API version of the getbuffer function call.  It checks
+   to make sure object has the required function pointer and issues the
+   call.
+
+   Returns -1 and raises an error on failure and returns 0 on success. */
+PyAPI_FUNC(int) PyObject_GetBuffer(PyObject *obj, Py_buffer *view,
+                                   int flags);
+
+/* Get the memory area pointed to by the indices for the buffer given.
+   Note that view->ndim is the assumed size of indices. */
+PyAPI_FUNC(void *) PyBuffer_GetPointer(Py_buffer *view, Py_ssize_t *indices);
+
+/* Return the implied itemsize of the data-format area from a
+   struct-style description. */
+PyAPI_FUNC(int) PyBuffer_SizeFromFormat(const char *);
+
+/* Implementation in memoryobject.c */
+PyAPI_FUNC(int) PyBuffer_ToContiguous(void *buf, Py_buffer *view,
+                                      Py_ssize_t len, char order);
+
+PyAPI_FUNC(int) PyBuffer_FromContiguous(Py_buffer *view, void *buf,
+                                        Py_ssize_t len, char order);
+
+/* Copy len bytes of data from the contiguous chunk of memory
+   pointed to by buf into the buffer exported by obj.  Return
+   0 on success and return -1 and raise a PyBuffer_Error on
+   error (i.e. the object does not have a buffer interface or
+   it is not working).
+
+   If fort is 'F', then if the object is multi-dimensional,
+   then the data will be copied into the array in
+   Fortran-style (first dimension varies the fastest).  If
+   fort is 'C', then the data will be copied into the array
+   in C-style (last dimension varies the fastest).  If fort
+   is 'A', then it does not matter and the copy will be made
+   in whatever way is more efficient. */
+PyAPI_FUNC(int) PyObject_CopyData(PyObject *dest, PyObject *src);
+
+/* Copy the data from the src buffer to the buffer of destination. */
+PyAPI_FUNC(int) PyBuffer_IsContiguous(const Py_buffer *view, char fort);
+
+/*Fill the strides array with byte-strides of a contiguous
+  (Fortran-style if fort is 'F' or C-style otherwise)
+  array of the given shape with the given number of bytes
+  per element. */
+PyAPI_FUNC(void) PyBuffer_FillContiguousStrides(int ndims,
+                                               Py_ssize_t *shape,
+                                               Py_ssize_t *strides,
+                                               int itemsize,
+                                               char fort);
+
+/* Fills in a buffer-info structure correctly for an exporter
+   that can only share a contiguous chunk of memory of
+   "unsigned bytes" of the given length.
+
+   Returns 0 on success and -1 (with raising an error) on error. */
+PyAPI_FUNC(int) PyBuffer_FillInfo(Py_buffer *view, PyObject *o, void *buf,
+                                  Py_ssize_t len, int readonly,
+                                  int flags);
+
+/* Releases a Py_buffer obtained from getbuffer ParseTuple's "s*". */
+PyAPI_FUNC(void) PyBuffer_Release(Py_buffer *view);
+
+/* ==== Iterators ================================================ */
+
+#define PyIter_Check(obj) \
+    ((obj)->ob_type->tp_iternext != NULL && \
+     (obj)->ob_type->tp_iternext != &_PyObject_NextNotImplemented)
+
+/* === Number Protocol ================================================== */
+
+#define PyIndex_Check(obj)                              \
+    ((obj)->ob_type->tp_as_number != NULL &&            \
+     (obj)->ob_type->tp_as_number->nb_index != NULL)
+
+/* === Sequence protocol ================================================ */
+
+/* Assume tp_as_sequence and sq_item exist and that 'i' does not
+   need to be corrected for a negative index. */
+#define PySequence_ITEM(o, i)\
+    ( Py_TYPE(o)->tp_as_sequence->sq_item(o, i) )
+
+#define PY_ITERSEARCH_COUNT    1
+#define PY_ITERSEARCH_INDEX    2
+#define PY_ITERSEARCH_CONTAINS 3
+
+/* Iterate over seq.
+
+   Result depends on the operation:
+
+   PY_ITERSEARCH_COUNT:  return # of times obj appears in seq; -1 if
+     error.
+   PY_ITERSEARCH_INDEX:  return 0-based index of first occurrence of
+     obj in seq; set ValueError and return -1 if none found;
+     also return -1 on error.
+   PY_ITERSEARCH_CONTAINS:  return 1 if obj in seq, else 0; -1 on
+     error. */
+PyAPI_FUNC(Py_ssize_t) _PySequence_IterSearch(PyObject *seq,
+                                              PyObject *obj, int operation);
+
+/* === Mapping protocol ================================================= */
+
+PyAPI_FUNC(int) _PyObject_RealIsInstance(PyObject *inst, PyObject *cls);
+
+PyAPI_FUNC(int) _PyObject_RealIsSubclass(PyObject *derived, PyObject *cls);
+
+PyAPI_FUNC(char *const *) _PySequence_BytesToCharpArray(PyObject* self);
+
+PyAPI_FUNC(void) _Py_FreeCharPArray(char *const array[]);
+
+/* For internal use by buffer API functions */
+PyAPI_FUNC(void) _Py_add_one_to_index_F(int nd, Py_ssize_t *index,
+                                        const Py_ssize_t *shape);
+PyAPI_FUNC(void) _Py_add_one_to_index_C(int nd, Py_ssize_t *index,
+                                        const Py_ssize_t *shape);
+
+/* Convert Python int to Py_ssize_t. Do nothing if the argument is None. */
+PyAPI_FUNC(int) _Py_convert_optional_to_ssize_t(PyObject *, void *);
+
+#ifdef __cplusplus
+}
+#endif