Tell Don't Ask Project Euler #1

Curried.rb

#http://projecteuler.net/problem=1
module SumMultiplesOf3And5
  def self.below number
    max = number - 1
    stepify([3,5], max).collect(&:step).reduce(:|).reduce(0, :+)
  end
  def self.stepify numbers, max
    numbers.map { |n| Stepper.new(n, max) }
  end
end
class Stepper
  def initialize value, max
    @value = value
    @max = max
  end
  def step
    @value.step(@max, @value).to_a
  end
end