one more test case.
Allow numeric characters in hash key.
Checking in changes prior to tagging of version 0.07.

Changelog diff is:

diff --git Changes Changes
index f92df8d..6ea1057 100644
--- Changes
+++ Changes
@@ -2,6 +2,11 @@ Revision history for Perl extension Data-NestedParams

 {{$NEXT}}

+0.07 2014-07-27T23:09:34Z
+
+    - Allow numeric characters in hash key.
+      (tokuhirom)
+
 0.06 2014-03-26T11:18:51Z

     - Allow _ and - in hash key.