merge revision(s) 27490:

* lib/net/imap.rb (fetch_internal): do not quote message data item
	  names.  Thanks, Eric Hodel.  [ruby-core:23508]  backported form
	  trunk.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8_7@28215 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/net/imap.rb

@@ -1164,9 +1164,15 @@ module Net
     end
 
     def fetch_internal(cmd, set, attr)
-      if attr.instance_of?(String)
+      case attr
+      when String then
         attr = RawData.new(attr)
+      when Array then
+        attr = attr.map { |arg|
+          arg.is_a?(String) ? RawData.new(arg) : arg
+        }
       end
+
       synchronize do
         @responses.delete("FETCH")
         send_command(cmd, MessageSet.new(set), attr)