Real constructor Null safety

1. jrpn
2. complex
3. Real
4. Real constructor

Real class

1. Constructors
2. Real
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. toString
9. Operators
10. operator ==
11. Static methods
12. acosh
13. asinh
14. atanh
15. cosh
16. sinh
17. tanh