AreaUnit

"""Unit an `Area` value was expressed in."""
enum AreaUnit {
  """Square millimetres. The internal canonical unit."""
  MM2
  """Square centimetres. 1 cm² = 100 mm²."""
  CM2
  """Square metres. 1 m² = 1 000 000 mm²."""
  M2
  """Square inches. 1 in² = 645.16 mm² exactly."""
  IN2
  """Square feet. 1 ft² = 144 in² = 92 903.04 mm²."""
  FT2
}