Unique sentinel value for cache.get()
diff --git a/Lib/functools.py b/Lib/functools.py
index adc7927..3eb55c6 100644
--- a/Lib/functools.py
+++ b/Lib/functools.py
@@ -175,8 +175,8 @@
# simple caching without ordering or size limit
nonlocal hits, misses
key = make_key(args, kwds, typed) if kwds or typed else args
- result = cache_get(key)
- if result is not None:
+ result = cache_get(key, root) # root used here as a unique not-found sentinel
+ if result is not root:
hits += 1
return result
result = user_function(*args, **kwds)