module ActionDispatch::Http::Parameters

def initialize(env) 

def initialize(env)
  super
  @symbolized_path_params = nil
end

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)
  case params
  when String
    params.force_encoding(Encoding::UTF_8).encode!
  when Hash
    if params.has_key?(:tempfile)
      UploadedFile.new(params)
    else
      params.each_with_object({}) do |(key, val), new_hash|
        new_key = key.is_a?(String) ? key.dup.force_encoding(Encoding::UTF_8).encode! : key
        new_hash[new_key] = if val.is_a?(Array)
          val.map! { |el| normalize_encode_params(el) }
        else
          normalize_encode_params(val)
        end
      end.with_indifferent_access
    end
  else
    params
  end
end

def parameters

Returns both GET and POST \parameters in a single hash. 
def parameters
  @env["action_dispatch.request.parameters"] ||= begin
    params = begin
      request_parameters.merge(query_parameters)
    rescue EOFError
      query_parameters.dup
    end
    params.merge!(path_parameters)
    params.with_indifferent_access
  end
end

def path_parameters

See symbolized_path_parameters for symbolized keys.

{'action' => 'my_action', 'controller' => 'my_controller'}

Returned hash keys are strings:
Returns a hash with the \parameters used to form the \path of the request. 
def path_parameters
  @env["action_dispatch.request.path_parameters"] ||= {}
end

def path_parameters=(parameters) #:nodoc:

:nodoc: 
def path_parameters=(parameters) #:nodoc:
  @symbolized_path_params = nil
  @env.delete("action_dispatch.request.parameters")
  @env["action_dispatch.request.path_parameters"] = parameters
end

def reset_parameters #:nodoc:

:nodoc: 
def reset_parameters #:nodoc:
  @env.delete("action_dispatch.request.parameters")
end

def symbolized_path_parameters

The same as path_parameters with explicitly symbolized keys. 
def symbolized_path_parameters
  @symbolized_path_params ||= path_parameters.symbolize_keys
end