GZipDecoder constructor Null safety

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

GZipDecoder class

1. Constructors
2. GZipDecoder
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. decodeBuffer
8. decodeBytes
9. decodeStream
10. noSuchMethod
11. toString
12. Operators
13. operator ==
14. Constants
15. DEFLATE
16. FLAG_COMMENT
17. FLAG_EXTRA
18. FLAG_HCRC
19. FLAG_NAME
20. FLAG_TEXT
21. SIGNATURE