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Description of problem: When comparing IPAddr values with eql? you get the wrong result Version-Release number of selected component (if applicable): Name : ruby Arch : x86_64 Version : 1.8.7.374 Release : 4.el6_6 How reproducible: Steps to Reproduce: 1. ruby -ripaddr -e 'p IPAddr.new("192.168.1.0/30").eql?(IPAddr.new("192.168.1.0/30"))' Actual results: false Expected results: true (which is what you see with ruby on RHEL 7) Additional info: eql? is missing in 1.8.7 This bug breaks array difference with arrays of IP addresses. Array difference uses 'eql?' under the hood rather than '=='
Neil, thank you for your ticket. You are right, in this case, the example you provided compares if it is actually the same object, e.g.: ~~~ $ ruby -ripaddr -e 'ip = IPAddr.new("192.168.1.0/30"); p ip == ip' ~~~ which is not very useful in most cases. And this [1] seems to be the commit which "fixed" the behavior. However, I am not sure it is worth of the change at this point, since: 1) The behavior was changed during Ruby 1.8.7 maintenance period, but it was never backported for Ruby 1.8.7 by upstream. 2) Also, considering RHEL6 release cycle, I don't see too much options to push this fix. I am going to CLOSE WONTFIX the issue for now, but please don't hesitate to contact Red Hat support, so we might reconsider in case this turns to be important. Thank you. [1] https://github.com/ruby/ruby/commit/61c11677c8ee20e07dea84a5a3bf8b68ff449188
Forgot to mention, that on RHEL6, you might consider to try Red Hat Software Collections, which provides more recent versions of Ruby.
The workaround on array diff is fairly straightforward. Rather than: source - dest do: source.clone.delete_if {|e| dest.include? e} This uses '==' equality rather than 'eql?' equality and it works as expected.