irb(main):002:0> "fedcb59726a1348".to_i(16).pmbgood(16) => true irb(main):003:0> "fedcb59726a1348".length => 15 irb(main):004:0> "fedcb59726a1348".to_i(16).pmbbad(16) => nil irb(main):005:0> "fedcb59726a1348".to_i(16) => 1147797065081426760