gFlag property Null safety

1. jrpn
2. model
3. NumStatus68
4. gFlag property

NumStatus68 class

1. Constructors
2. NumStatus68
3. Properties
4. cFlag
5. gFlag
6. hashCode
7. integerSignMode
8. isFloatMode
9. maxInt
10. minInt
11. runtimeType
12. signMask
13. wordMask
14. wordSize
15. Methods
16. noSuchMethod
17. signExtendFrom
18. toString
19. Operators
20. operator ==