Checking in changes prior to tagging of version 0.04. Changelog diff is:

diff --git a/perl/Changes b/perl/Changes
index 0c170a3..33fb36c 100644
--- a/perl/Changes
+++ b/perl/Changes
@@ -1,3 +1,11 @@
+0.04
+
+    - check SvROK first(reported by yappo++)
+    - PreferInteger: faster string to integer conversion; support negative value
+      (frsyuki++)
+    - make PreferInteger variable magical and remove get_sv from _msgpack_pack_sv
+      (frsyuki++)
+
 0.03

     - performance tuning for too long string

perl/lib/Data/MessagePack.pm

@@ -4,7 +4,7 @@ use warnings;
 use XSLoader;
 use 5.008001;
 
-our $VERSION = '0.03';
+our $VERSION = '0.04';
 our $PreferInteger = 0;
 
 XSLoader::load(__PACKAGE__, $VERSION);