Better currying for Ruby Proc objects

curried_proc.rb

class Proc                                                                                                                                                                                            
  def _(*args)
    CurriedProc.new(args, &self)
  end
end

class CurriedProc < Proc
  def initialize(args, &block)
    msg = "Curried arguments is greater than block arity (#{args.size} > #{block.arity})"
    raise ArgumentError, msg if args.size > block.arity
    @curried_args = args
    @orig_arity   = block.arity
    @orig_proc    = block
  end

  def arity
    @orig_arity - @curried_args.size
  end

  def call(*args)
    msg = "Wrong number of arguments (#{args.size} of #{arity}) - curried"
    raise ArgumentError, msg if args.size > arity
    new_args = @curried_args + args.take(arity)
    @orig_proc.call(*new_args)
  end

  def _(*args)
    self.class.new(@curried_args + args, &@orig_proc)
  end
end