lib/ipaddress/prefix.rb in ipaddress-0.7.0 vs lib/ipaddress/prefix.rb in ipaddress-0.7.5

@@ -90,12 +90,12 @@
     #
     #   prefix = IPAddress::Prefix32.new 24
     #     #=> 24
     #
     def initialize(num)
-      unless (1..32).include? num
-        raise ArgumentError, "Prefix must be in range 1..32, got: #{num}"
+      unless (0..32).include? num
+        raise ArgumentError, "Prefix must be in range 0..32, got: #{num}"
       end
       super(num)
     end
 
     #
@@ -119,10 +119,10 @@
     # 
     #   prefix.bits 
     #     #=> "11111111111111111111111100000000"
     #
     def bits
-      to_u32.to_s(2)
+      "%.32b" % to_u32
     end
 
     #
     # Gives the prefix in IPv4 dotted decimal format, 
     # i.e. the canonical netmask we're all used to