XZDecoder constructor Null safety

1. Flutter
2. archive_io
3. XZDecoder
4. XZDecoder constructor

XZDecoder class

1. Constructors
2. XZDecoder
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. decodeBuffer
8. decodeBytes
9. noSuchMethod
10. toString
11. Operators
12. operator ==