fromBCD

0.fromBCD().shouldEqual(0);

(0x22).fromBCD().shouldEqual(22);
(34).fromBCD().shouldEqual(22);
// 17bcd
(0b0001_0111).fromBCD().shouldEqual(17);
295.fromBCD().shouldEqual(127);
39_321.fromBCD().shouldEqual(9_999);
(0x9999).fromBCD().shouldEqual(9_999);