100000000000000.02  ≈    100000000000000.02
              100.01  ≉               100.011
  1000000000.0000002  ≈    1000000000.0000001
               0.001  ≉          0.0010000001
            1.01e-22  ≉                     0
  2.0000000000000004  ≈                     2
 -2.0000000000000004  ≈                    -2
   3.141592653589793  ≈     3.141592653589793