Rails - Jun 2006 - Double encoded ampersands in form actions

My form tag looks like:
<%= form_tag :controller => "admin", :action =>
''update_preset'', :id =>
@preset, :popup => params[:popup], :editor => params[:editor] %>

which I want to be rendered something like:
<form
action="/admin/documents/update_preset/?editor=1&amp;popup=1"
method="post">

but instead I get double encoded ampersands in the url:
<form
action="/admin/documents/update_preset/?editor=1&amp;amp;popup=1"
method="post">

This only seems to be a problem with the url_for_options within form 
tags. Any suggestions?

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