From: cardoso_tiago@...
Date: 2018-03-17T23:52:46+00:00
Subject: [ruby-core:86170] [Ruby trunk Bug#14612] IPv6 address inconsistency (downcase vs. upcase)

Issue #14612 has been reported by chucke (Tiago Cardoso).

----------------------------------------
Bug #14612: IPv6 address inconsistency (downcase vs. upcase)
https://bugs.ruby-lang.org/issues/14612

* Author: chucke (Tiago Cardoso)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.5.0
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
----------------------------------------
I've noticed that sometimes ip addresses re shown using a-f characters in downcase, other times upcase. Here is a small script to show results:

```ruby
require "resolv"
require "socket"
puts TCPSocket.getaddress("nghttp2.org") #=> "2400:8902::f03c:91ff:fe69:a454"
puts Resolv.getaddresses("nghttp2.org") #=> ["139.162.123.134", "2400:8902::F03C:91FF:FE69:A454"]
```

Results might be system-dependent (I'm using Mac OS High Sierra).

This makes compare operations a bit harder. 



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