hashの値の比較にsymbolでも文字列でも同値とする

hash_with_value_indifferent_access.rb

require 'forwardable'
class HashWithValueIndifferentAccess
  extend Forwardable
  attr_accessor :hash
  def_delegators(:@hash,*({}.public_methods - Object.new.public_methods - ["[]","[]=","values","==","to_s"]))

  def initialize(hash={})
    @hash={}
    hash.each do|k,v|
      if v.is_a?(Symbol)
        @hash[k] = v.to_s
      else
        @hash[k] = v
      end
    end
  end

  def values
    @hash.values.map{|v| v.is_a?(String) ? SymboledString.new(v) : v}
  end

  def [](key)
    if @hash[key].is_a?(String)
      SymboledString.new(@hash[key])
    else
      @hash[key] 
    end
  end

  def []=(key,val)
    if val.is_a?(Symbol)
      @hash[key] = val.to_s
    else
      @hash[key] = val
    end
  end

  def ==(vals)
    vals.keys==@hash.keys && values == @hash.values
  end

  def to_s
    @hash.to_s
  end
end
class SymboledString < String
  def ==(val)
    if val.is_a?(Symbol)
      val.to_s == self
    else
      val == self
    end
  end
end