Failed to parse connection string that starts with number greater than 255

irb(main):012:0> Couchbase::Backend.parse_connection_string("couchbases://255test.com")

=> {:scheme=>"couchbases", :tls=>true, :nodes=>[{:address=>"255test.com", :type=>:dns}], :params=>{}, :default_port=>11207, :default_mode=>:gcccp}

irb(main):013:0> Couchbase::Backend.parse_connection_string("couchbases://256test.com")

=> {:scheme=>"couchbases", :tls=>true, :nodes=>[], :params=>{}, :default_port=>11207, :default_mode=>:gcccp, :error=>"failed to parse connection string (column: 16, trailer: \"6test.com\")"}