Rails - May 2011 - Array params in form_tag

Hello i have a lot of time trying to figure this out.
I am having problem sending array params with form_tag :remote=>true

form.erb
  <%#= form_tag reporte_client_reports_path do%>
  <%= form_tag reporte_client_reports_path,:remote=>true do%>
   <p>
     <%= label_tag :cuts %>
     <%= select_tag "cuts[]",
options_from_collection_for_select(@cuts,
"real_cut", "cut"), :multiple=>true, :id =>
"cuts"%>
  </p>

 <p>
   <%= submit_tag ''Send'' %>
 </p>
<%end%>

Controller
def report
      @cuts = params[:cuts]

 respond_to do |format|
        format.html {render :layout => false if request.xhr?}
        format.js #{render :layout => false}
  end
end

Results

debug results:
 - 2011-02-15,2011-02-28,2011-03-15,2011-03-31


It work if i use
  <%= form_tag reporte_client_reports_path do%>

debug results:
---
- "2011-02-15"
- "2011-02-28"
- "2011-03-15"
- "2011-03-31"


The problem is in remote the form pass the parameters not as a array :s

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I resolved in functional way, but there might be something very weird 
with this in my controller:

if request.xhr?
        @super = params[:supermercados].to_s.split(",")
        @cortess = params[:cortes].to_s.split(",")
        @prods = params[:productos].to_s.split(",")
end

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