Only thing not working as expected is that the h helper did escape html_safe output, but we can fix that easily…

# make h work the same no matter if a string is safe
# ERB::Util.h("
".html_safe).should_not == "
"
module ERB::Util
  def html_escape(s)
    s.to_s.gsub(/[&"><]/) { |special| HTML_ESCAPE[special] }
  end
  alias h html_escape
  module_function :h
  module_function :html_escape
end