You can clone with
HTTPS or Subversion.
The following sentence is in the IPAddress::IPv4#include? documentation: "Accepts either string with the IP or and IPAddress::IPv4 object." In addition to the typo ("or and"), the sentence doesn't seem accurate (the source makes it look like it needs an object, not a simple string containing the IP).
Fixed IPv4#include? documentation - thanks to jrdioko (closed by 66473bf)