Return strict boolean, for clarity.

lib/geocoder/ip_address.rb

@@ -3,7 +3,7 @@ module Geocoder
   class IpAddress < String
 
     def loopback?
-      valid? and (self == "0.0.0.0" or self.match(/\A127\./) or self == "::1")
+      valid? and !!(self == "0.0.0.0" or self.match(/\A127\./) or self == "::1")
     end
 
     def valid?