Ruby on Rails - Float variable IF statement

I don't know if it's "normal" but whenever I want to use my variables in statements I need to convert them into integer/float even if I declare them as integer/float. Am I doing something wrong or is it just the way that Ruby works ? Thanks

For example, my declarations :

  Struct.new("Pack", :id, :qty, :promo, :reduction)
  @@pack1 = Struct::Pack.new(1, 10, 0, 0.1)
  @@pack2 = Struct::Pack.new(2, 25, 0, 0.1)
  @@pack3 = Struct::Pack.new(3, 50, 5, 0.1)
  @@pack4 = Struct::Pack.new(4, 100, 10, 0.1)

  def self.packs
    [0, @@pack1, @@pack2, @@pack3, @@pack4]
  end

Let's take reduction for this example. When I use them it is not recognize as float even if I declare them as 0.1 without " ". Doesn't enter in IF statement:

def my_function(pack_id)
  reduction = MyModel.packs[pack_id].reduction
  Rails.logger.debug reduction   # Print 0.1
  if reduction > 0.0
    # Some stuff
  end
end

IF statement is working :

def my_function(pack_id)
  reduction = MyModel.packs[pack_id].reduction.to_f
  Rails.logger.debug reduction   # Print 0.1
  if reduction > 0.0
    # Some stuff
  end
end

For information :

2.1.3 :001 > MyModel.packs
 => [0, #<struct Struct::Pack id=1, qty=10, promo=0, reduction=0.1>, #<struct Struct::Pack id=2, qty=25, promo=0, reduction=0.1>, #<struct Struct::Pack id=3, qty=50, promo=5, reduction=0.1>, #<struct Struct::Pack id=4, qty=100, promo=10, reduction=0.1>] 
2.1.3 :002 > MyModel.packs[1].reduction
 => 0.1 
2.1.3 :003 > MyModel.packs[1].reduction.type
NoMethodError: undefined method `type' for 0.1:Float

EDIT :

The main difference seams here, I can't explain why right now. When my application is running :

Rails.logger.debug MyModel.packs[1].reduction.class # Fixnum

In rails console :

2.1.3 :012 >   MyModel.packs[1].reduction.class
 => Float