Forgot the "empty string -> hash == 0" special case for strings.
diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 716ca3f..75e9923 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -11219,6 +11219,14 @@
if (PyUnicode_READY(self) == -1)
return -1;
len = PyUnicode_GET_LENGTH(self);
+ /*
+ We make the hash of the empty string be 0, rather than using
+ (prefix ^ suffix), since this slightly obfuscates the hash secret
+ */
+ if (len == 0) {
+ _PyUnicode_HASH(self) = 0;
+ return 0;
+ }
/* The hash function as a macro, gets expanded three times below. */
#define HASH(P) \