Scale: 2**124 = 21267647932558653966460912964485513216
Epsilon: 0.00000000000000000000000000000000000004701977403289150031874946148888982711275
//// example: Pi
 orig: 3.14159265358979323846264338327950288419716940
fixed: 3243F6A8885A308D313198A2E0370734
 conv: 3.141592653589793238462643383279502884184
//// properties of mul_fixed
smallest possible multiplicand: 0.0000000000000000002168404344971008868014905601739883422852
  too small: 00000000000000003FC07FA1F14C2C48
	* 3 = 0
just enough: 0000000000000000400C0E7219869986
	* 3 = 0.0000000000000000006505213034913026604044716805219650268555
//// test case: (45e-10)**2
 input value: 0.0000000045
 as fixed-pt: 00000001353CD652BB1674942F2A17B4
fixed-pt mul: 000000000000001758BEBD8531A08964
   converted: 0.00000000000000002024999999819822726902629450354716965624
    expected: 0.00000000000000002025