Improve inferrability of setindex!

[tkf]

No description provided.

[codecov]

Codecov Report

Merging #27 (c3be364) into master (6c41b70) will decrease coverage by 3.89%.
The diff coverage is 93.33%.

@@            Coverage Diff             @@
##           master      #27      +/-   ##
==========================================
- Coverage   70.93%   67.03%   -3.90%     
==========================================
  Files           6        6              
  Lines         203      270      +67     
==========================================
+ Hits          144      181      +37     
- Misses         59       89      +30     

Flag	Coverage Δ
unittests	47.92% <90.90%> (-4.32%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/impl/utils.jl	61.01% <80.00%> (-4.37%)	⬇️
src/impl/vectors.jl	75.00% <100.00%> (-6.40%)	⬇️
src/impl/arrays.jl	58.53% <0.00%> (-10.22%)	⬇️
src/UnionArrays.jl	66.66% <0.00%> (+16.66%)	⬆️

---

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 6c41b70...c3be364. Read the comment docs.