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note
rexml
aws-sdk-core requires either libxml,nokogiri,oga,ox or rexml. https://github.com/aws/aws-sdk-ruby/blob/7b563dc8389ad4d1604a652a5cd3c8ace622208a/gems/aws-sdk-core/lib/aws-sdk-core/xml/parser.rb#L70-L72
In ruby3 rexml gem is not installed by default https://www.ruby-lang.org/en/news/2020/12/25/ruby-3-0-0-released/
Now rexml dependent on crack from v0.4.5 jnunemaker/crack#62 .
But I think it was just a coincidence.
So, I add rexml to runtime dependency.
Application using mini_paperclip can use nokogiri or others if it's installed.