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@@ -84,3 +84,9 @@ with all sufficient information, see the ChangeLog file.
* struct RBignum is hidden. [Feature #6083]
Use rb_integer_pack and rb_integer_unpack instead.
+
+* st hash table uses power-of-two sizes for speed [Feature #9425].
+ Lookups are 10-25% faster if using appropriate hash functions.
+ However, weaknesses in hash distribution can no longer be masked
+ by prime number-sized tables, so extensions may need to tweak
+ hash functions to ensure good distribution.