Add more @useResult

[nohli]

No description provided.

[codecov]

Codecov Report

Merging #196 (56ddf7f) into master (80402d4) will increase coverage by 0.01%.
The diff coverage is 94.44%.

@@            Coverage Diff             @@
##           master     #196      +/-   ##
==========================================
+ Coverage   99.22%   99.23%   +0.01%     
==========================================
  Files          40       40              
  Lines        1926     1954      +28     
==========================================
+ Hits         1911     1939      +28     
  Misses         15       15              

Flag	Coverage Δ
unittests	99.23% <94.44%> (+0.01%)	⬆️

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

Impacted Files	Coverage Δ
lib/src/collection/kt_set.dart	86.04% <77.77%> (+1.04%)	⬆️
lib/src/collection/kt_list.dart	97.80% <90.00%> (+0.02%)	⬆️
lib/src/collection/collections.dart	100.00% <100.00%> (ø)
lib/src/collection/interop.dart	100.00% <100.00%> (ø)
lib/src/collection/kt_iterable.dart	99.54% <100.00%> (+<0.01%)	⬆️
lib/src/collection/kt_map.dart	100.00% <100.00%> (ø)
lib/src/collection/tuples.dart	100.00% <100.00%> (ø)
... and 2 more

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[passsy]