It has been documented as unused since 6c6844a2fa30 (2000-05-25)

Patch by Eric N. Vander Weele.

It was renamed to README.txt in d90a65014c42 and it was
back by a merge commit accidentally.

add_methods(), add_members(), and add_getset() used PyDict_SetItemString()
to register descriptor to the type's dict.
So descr_new() and PyDict_SetItemString() creates interned unicode from same
C string.

This patch takes interned unicode from descriptor, and use PyDict_SetItem()
instead of PyDict_SetItemString().

python_startup_no_site:
  default: Median +- std dev: 12.7 ms +- 0.1 ms
  patched: Median +- std dev: 12.5 ms +- 0.1 ms

a macro if Py_LIMITED_API is not set or set to the value between 0x03050400
and 0x03060000 (not including) or 0x03060100 or higher.  Added functions
PySlice_Unpack() and PySlice_AdjustIndices().

Py_LIMITED_API is not set or set to the value between 0x03050400
and 0x03060000 (not including) or 0x03060100 or higher.

Py_LIMITED_API is not set or set to the value between 0x03050400
and 0x03060000 (not including) or 0x03060100 or higher.

Patch contributed by Mariatta Wijaya.