Sinatra failing to produce multiple param values

sinatra-multiple-values-fail

# Sinatra 1.2.6 doesn't appear to properly handle multiple values for a form parameter. 'params[:my_param_name]'
# only returns the last one supplied. I've verified that Chrome is sending the full list, and the list appears in 
# the rack.request.query_string variable (but not the rack.request.params variable).

# This comes straight outta rack so it's not actually sinatra's fault. It's also undocumented magic in the 
# rack/utils.rb#normalize_params method.

require 'rubygems'
require 'sinatra'

get '/lame' do
  erb :lame
end

post '/lame' do
  puts params.inspect
  puts request.inspect
  puts params[:select_multiple_values]
end

__END__

@@ lame
<form method="POST" action="/lame">
<select name="select_multiple_values[]" multiple size="5">
  <option value="First Option">Option 1
  <option value="Second Option">Option 2
  <option value="Third Option">Option 3
</select>
<input type="submit">
</form>