Gahhh! 0 is a valid input value!
Checking in changes prior to tagging of version 0.08.

Changelog diff is:

diff --git a/Changes b/Changes
index 583706d..c832bf2 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,11 @@ Revision history for Perl extension Caroline

 {{$NEXT}}

+0.08 2013-08-12T11:13:31Z
+
+    - Ah. older version can't input '0'.... '0' is a valid input value!
+      (tokuhirom)
+
 0.07 2013-08-10T22:57:02Z

     - Fixed line editing issue