Remove comment after clarification and add test case for this.

[FelixPetriconi]

Fix issue #18

[codecov]

Codecov Report

Merging #99 into develop will increase coverage by 0.06%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop      #99      +/-   ##
===========================================
+ Coverage    94.85%   94.91%   +0.06%     
===========================================
  Files           36       36              
  Lines         4530     4545      +15     
  Branches       222      222              
===========================================
+ Hits          4297     4314      +17     
+ Misses          90       88       -2     
  Partials       143      143

Impacted Files	Coverage Δ
stlab/concurrency/future.hpp	87.94% <ø> (+0.62%)	⬆️
test/future_tests.cpp	98.19% <ø> (-0.49%)	⬇️
test/future_then_tests.cpp	99.19% <0%> (-0.27%)	⬇️
test/channel_test_helper.hpp	93.75% <0%> (+1.25%)	⬆️

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