module ActionDispatch::Http::Parameters

def normalize_encode_params(params)

should really prevent that from happening
you'll get a weird error down the road, but our form handling
TODO: Validate that the characters are UTF-8. If they aren't,

and UTF-8 encode both keys and values in nested Hash.
Convert nested Hash to HashWithIndifferentAccess 
def normalize_encode_params(params)
  if params.is_a?(String)
    return params.force_encoding(Encoding::UTF_8).encode!
  elsif !params.is_a?(Hash)
    return params
  end
  new_hash = {}
  params.each do |k, v|
    new_key = k.is_a?(String) ? k.dup.force_encoding(Encoding::UTF_8).encode! : k
    new_hash[new_key] =
      case v
      when Hash
        normalize_encode_params(v)
      when Array
        v.map! {|el| normalize_encode_params(el) }
      else
        normalize_encode_params(v)
      end
  end
  new_hash.with_indifferent_access
end