From 9d60b94427f42b3f543e398205113a1b18b43598 Mon Sep 17 00:00:00 2001
From: Raymond Hettinger <python@rcn.com>
Date: Sun, 8 Jan 2017 19:34:28 -0800
Subject: [PATCH] Sync-up lru_cache() C code with space saving feature in the
 Python version.

---
 Modules/_functoolsmodule.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Modules/_functoolsmodule.c b/Modules/_functoolsmodule.c
index 62b45e98cb..bc34c215b4 100644
--- a/Modules/_functoolsmodule.c
+++ b/Modules/_functoolsmodule.c
@@ -709,6 +709,12 @@ lru_cache_make_key(PyObject *args, PyObject *kwds, int typed)
 
     /* short path, key will match args anyway, which is a tuple */
     if (!typed && !kwds) {
+        if (PyTuple_GET_SIZE(args) == 1) {
+            /* Save space and improve speed by unwrapping 1-tuples */
+            key = PyTuple_GET_ITEM(args, 0);
+            Py_INCREF(key);
+            return key;
+        }
         Py_INCREF(args);
         return args;
     }
-- 
2.40.0