qoobaa/s3 issue with version 0.3.26

output.txt

lisas@lisas ~ $ for v in ruby-1.8.7-p374 ruby-2.1.7 ruby-2.4.0 ruby-2.5.0; do rvm use $v; ruby tester.rb ; done
Using /Users/lisas/.rvm/gems/ruby-1.8.7-p374
Ruby version: 1.8.7
@ivar is defined
@notvar is not defined
Using /Users/lisas/.rvm/gems/ruby-2.1.7
Ruby version: 2.1.7
@ivar is defined
@notvar is not defined
Using /Users/lisas/.rvm/gems/ruby-2.4.0
Ruby version: 2.4.0
@ivar is defined
@notvar is not defined
Using /Users/lisas/.rvm/gems/ruby-2.5.0
Ruby version: 2.5.0
@ivar is defined
@notvar is not defined

tester.rb

## tester.rb
class Test
  def initialize
    @ivar = nil
  end
  
  def isdef
    if defined?(@ivar)
      puts "@ivar is defined"
    else
      puts "@ivar is not defined"
    end

    if defined?(@notvar)
      puts "@notvar is defined"
    else
      puts "@notvar is not defined"
    end
  end
end

puts "Ruby version: #{RUBY_VERSION}"
tester = Test.new

tester.isdef