--- alexandria-0.6.9/lib/alexandria/preferences.rb.negative	2011-11-19 23:48:14.000000000 +0900
+++ alexandria-0.6.9/lib/alexandria/preferences.rb	2013-10-07 11:56:16.598198605 +0900
@@ -326,7 +326,7 @@
         return true
       elsif value == "false"    # bool 
         return false
-      elsif value =~ /^[0-9]+$/   # int
+      elsif value =~ /^-?[0-9]+$/   # int
         return value.to_i
       elsif value =~ /^\[(.*)\]$/ # list (assume of type String)
         return $1.split(",")