Define constructorof for Tuple and NamedTuple?

[tkf]

I started implementing this because I remember doing something similer in Kaleido.jl but then realized that what I did in Kaleido.jl is a bit differnt from actual constructorof spec. So, this PR is not driven by a real need at this point. However, since Tuple and NamedTuple are so basic that I think it makes sense to support this. What do you think?

(One potential benefit was that we can remove setproperties(::NamedTuple, ::NamedTuple) with this PR. But the inference test failed with the generic fallback so that's no go.)

[codecov-io]

Codecov Report

Merging #16 into master will increase coverage by 0.89%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #16      +/-   ##
==========================================
+ Coverage   92.85%   93.75%   +0.89%     
==========================================
  Files           1        1              
  Lines          14       16       +2     
==========================================
+ Hits           13       15       +2     
  Misses          1        1

Impacted Files	Coverage Δ
src/ConstructionBase.jl	93.75% <100%> (+0.89%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ee593e5...169e7e4. Read the comment docs.

[tkf]

But the inference test failed with the generic fallback so that's no go.

For fun, #17 implements a type-stable constructorof(::Type{<:NamedTuple})(args...).

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.75%. Comparing base (ee593e5) to head (169e7e4).
Report is 180 commits behind head on master.

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #16      +/-   ##
==========================================
+ Coverage   92.85%   93.75%   +0.89%     
==========================================
  Files           1        1              
  Lines          14       16       +2     
==========================================
+ Hits           13       15       +2     
  Misses          1        1              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.