code: def test_F_float(self):
      self.assert_pack(
          "F", "F;32F", 4, 1.539989614439558e-36, 4.063216068939723e-34
      )
  
      if sys.byteorder == "little":
          self.assert_pack(
              "F", "F", 4, 1.539989614439558e-36, 4.063216068939723e-34
          )
          self.assert_pack(
              "F",
              "F;32NF",
              4,
              1.539989614439558e-36,
              4.063216068939723e-34,
          )
      else:
          self.assert_pack(
              "F", "F", 4, 2.387939260590663e-38, 6.301941157072183e-36
          )
          self.assert_pack(
              "F",
              "F;32NF",
              4,
              2.387939260590663e-38,
              6.301941157072183e-36,
          )
  
imports: from __future__ import annotations
  import sys
  import pytest
  from PIL import Image
label_desc: Use image node_id 18 for calling the TestLibPack obj's underlying member method code with example usage: obj.test_F_float() without return types