gem xmlsimple behaves unexplectedly after adding aws-s3 gem

Hi all,
after spending a long night trying to track down some unexpected spec
failures in my app I came to the conclusion that the reason was aws-s3
gem, which probably monkey patches XmlSimple class and changes its
behaviour so that xml_in method won't honor passed options anymore.
Here is a simple spec file to prove it... uncomment line 4 to make it
fail.

require 'rubygems'
require 'spec'
require 'xmlsimple'
# require 'aws/s3'

module XmlSimpleHelper
  def xml_sample
    %q(
      <greetings>
        <greeting>Ciao</greeting>
        <greeting>Hello</greeting>
      </greetings>
    )
  end
end

describe XmlSimple do
  include XmlSimpleHelper
  it 'should remove root tag by default' do
    expected = {'greeting' => ["Ciao", "Hello"]}
    XmlSimple.xml_in(xml_sample).should == expected
  end

  it 'should keep root tag when asked' do
    options = {'KeepRoot' => true}
    expected = {'greetings' => [{'greeting' => ["Ciao", "Hello"]}]}
    XmlSimple.xml_in(xml_sample, options).should == expected
  end

  it 'should force to array when asked' do
    options = {'ForceArray' => true}
    expected = {'greeting' => ["Ciao", "Hello"]}
    XmlSimple.xml_in(xml_sample, options).should == expected
  end
end

All gems were freshly updated... I haven'l looked at aws-s3 code yet,
I will do later, in the meanwhile I'd like to know other people
opinion, if this is some kind of bug in the gem or what...

TIA

Andrea Longhi

Again, the aws-s3 gem keeps biting my hand:

require 'rubygems'
require 'spec'
require 'xmlsimple'
require 'aws/s3' # remove to test pass

def xml
  %q(<price currency="USD">10.99</price>)
end

def expected
    {"content"=>"10.99", "currency"=>"USD"}
end

describe XmlSimple do
  it 'should return expected content' do
    data = XmlSimple.xml_in(xml, 'keeproot' => false)
    data.should == expected
  end
end