(#1573) Generify `org.cactoos.experimental` package.

[rocket-3]

For #1573.

• Generified parameter types in constructors of org.cactoos.experimental.Threads class
• Removed todo comment

Actually one class and one constructor, which contract, in my opinion, could be relaxed.

[rocket-3]

@0crat status

[rocket-3]

@0crat, status

[0crat]

Are you speaking to me or about me here; you must always start your message with my name if you want to address it to me, see §1

[victornoel]

@0crat status

[codecov-commenter]

Codecov Report

Merging #1627 (a14ab90) into master (445cf16) will decrease coverage by 0.01%. The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1627      +/-   ##
============================================
- Coverage     90.12%   90.10%   -0.02%     
- Complexity     1602     1603       +1     
============================================
  Files           298      298              
  Lines          3745     3749       +4     
  Branches        122      122              
============================================
+ Hits           3375     3378       +3     
  Misses          337      337              
- Partials         33       34       +1     

Impacted Files	Coverage Δ
...rc/main/java/org/cactoos/experimental/Threads.java	100.00% <ø> (ø)
src/main/java/org/cactoos/scalar/Solid.java	90.00% <0.00%> (-10.00%)	:arrow_down:
src/main/java/org/cactoos/map/MapOf.java	100.00% <0.00%> (ø)

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[rocket-3]

@victornoel, how can I fix that failed code coverage check?

[victornoel]

@rocket-3 no need to, it's more of a glitch than an actual problem, minus 0.02% is the same as no changes. I never found how to prevent this unfortunately...

[victornoel]

@0crat status

[0crat]

@0crat status (here)

@victornoel This is what I know about this job in C63314D6Z, as in §32:

• The job #1627 is not in scope
• Job footprint (restricted area)

[victornoel]

@0crat in

[rocket-3]

@0crat status

[victornoel]

@rultor merge

[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)