lib/validation/adjustment.rb
def INJECT(adjuster1, adjuster2, *adjusters)
      adjusters = [adjuster1, adjuster2, *adjusters]

      unless adjusters.all?{|f|adjustable? f}
        raise TypeError, 'wrong object for adjuster'
      end

      ->v{
        adjusters.reduce(v){|ret, adjuster|adjuster.call ret}
      }
    end
def INJECT(adjuster1, adjuster2, *adjusters)
      adjusters = [adjuster1, adjuster2, *adjusters]

      unless adjusters.all?{|f|adjustable? f}
        raise TypeError, 'wrong object for adjuster'
      end

      ->v{
        adjusters.reduce(v){|ret, adjuster|adjuster.call ret}
      }
    end
Sequencial apply all adjusters.
 @param adjuster1 [Proc, #to_proc]
 @param adjuster2 [Proc, #to_proc]
 @param adjusters [Proc, #to_proc]
 @return [lambda]