fails:Float.induced_from returns the passed argument when passed a Float
fails:Float.induced_from converts passed Fixnums or Bignums to Floats (using #to_f)
fails:Float.induced_from does not try to convert non-Integers to Integers using #to_int
fails:Float.induced_from does not try to convert non-Integers to Floats using #to_f
fails:Float.induced_from raises a TypeError when passed a non-Integer
