(#1533) Exploit generic variance in package bytes

[baudoliver7]

For #1533

• Use generic variance in package bytes as explained in Exploit generic variance to ensure typing works as best as possible #1533

[baudoliver7]

@andreoss Please, see my new changes.

[baudoliver7]

@andreoss ping

[baudoliver7]

@andreoss ping

[baudoliver7]

@andreoss ping

[baudoliver7]

@victornoel Please see my changes.

[victornoel]

@rultor merge

[victornoel]

@baudoliver7 thx

[rultor]

@rultor merge

@victornoel OK, I'll try to merge now. You can check the progress of the merge here

[rultor]

@rultor merge

@victornoel Done! FYI, the full log is here (took me 9min)

[0crat]

@sereshqua/z please review this job completed by @andreoss/z, as in §30; the job will be fully closed and all payments will be made when the quality review is completed

[sereshqua]

@andreoss please make sure you will find at least 3 issues during next CR, thanks!

[sereshqua]

@0crat quality acceptable