How to make an updated sBulletDNAstr/sBulletDNAstr64?

[TreyWang]

How to make an updated sBulletDNAstr/sBulletDNAstr64, If I wanna add new serialization structures in btRigidBodyFloatData？
What the meaning of sBulletDNAstr/sBulletDNAstr64?
char sBulletDNAstr[]= {
char(83),char(68),char(78),char(65),char(78),char(65),char(77),char(69),char(123),char(1),char(0),char(0),char(109),char(95),char(115),char(105),char(122),char(101),char(0),char(109),
char(95),char(99),char(97),char(112),char(97),char(99),char(105),char(116),char(121),char(0),char(42),char(109),char(95),char(100),char(97),char(116),char(97),char(0),char(109),char(95),
char(99),char(111),char(108),char(108),char(105),char(115),char(105),char(111),char(110),char(83),char(104),char(97),char(112),char(101),char(115),char(0),char(109),char(95),char(99),char(111),
char(108),char(108),char(105),char(115),char(105),char(111),char(110),char(79),char(98),char(106),char(101),char(99),char(116),char(115),char(0),char(109),char(95),char(99),char(111),char(110),
char(115),char(116),char(114),char(97),char(105),char(110),char(116),

[TreyWang]

blender\extern\bullet2\src\LinearMath\btSerializer.h