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+Tue Jun  3 13:41:08 2008  Akinori MUSHA  <knu@iDaemons.org>
+
+	* lib/set.rb (Set#collect, Set#select): Override Enumerable
+	  methods and make them return a set. [ruby-core:17055]
+	  (Set#delete_if, Set#collect!, Set#reject!, Set#classify)
+	  (Set#divide, Set#delete_if): Return an enumerator if no block is
+	  given.
+	  (Set#classify): Define an alias `group_by' to override that of
+	  Enumerable.
+
 Tue Jun  3 13:35:40 2008  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* process.c (run_exec_pgroup): C99 ism.