nari	2014-03-26 23:19:10 +0900 (Wed, 26 Mar 2014)

  New Revision: 45440

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=45440

  Log:
    [DOC] Add NEWS about Symbol GC

  Modified files:
    trunk/NEWS
Index: NEWS
===================================================================
--- NEWS	(revision 45439)
+++ NEWS	(revision 45440)
@@ -23,6 +23,9 @@ with all sufficient information, see the https://github.com/ruby/ruby/blob/trunk/NEWS#L23
 * Symbol
   * New methods
     * Symbol.find(str) returns whether given string is defined as symbol or not.
+  * Improvements
+    * Most symbols in Ruby level are GC-able (generated by String#to_sym and
+      String#intern)
 
 === Core classes compatibility issues (excluding feature bug fixes)
 
@@ -89,3 +92,9 @@ with all sufficient information, see the https://github.com/ruby/ruby/blob/trunk/NEWS#L92
   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.
+
+* rb_sym2str() added. This is almost same as `rb_id2str(SYM2ID(sym))`
+  but not pinning a dynamic symbol.
+
+* struct RSymbol added. This represents a dynamic symbol as object in
+  Ruby's heaps.

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