Fixes for 1.3

[FelixPetriconi]

No description provided.

[codecov]

Codecov Report

Merging #170 into develop will decrease coverage by 0.12%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop     #170      +/-   ##
===========================================
- Coverage    97.54%   97.41%   -0.13%     
===========================================
  Files           38       38              
  Lines         5665     5691      +26     
===========================================
+ Hits          5526     5544      +18     
- Misses         139      147       +8

Impacted Files	Coverage Δ
stlab/concurrency/system_timer.hpp	94.44% <100%> (ø)	⬆️
test/future_when_all_arguments_tests.cpp	91.8% <100%> (+0.13%)	⬆️
test/future_when_all_range_tests.cpp	93.25% <100%> (+0.28%)	⬆️
stlab/concurrency/future.hpp	97.15% <100%> (+0.02%)	⬆️
stlab/concurrency/default_executor.hpp	100% <100%> (ø)	⬆️
test/future_when_any_range_tests.cpp	96.33% <100%> (+0.03%)	⬆️
test/future_when_any_arguments_tests.cpp	95.48% <100%> (+0.03%)	⬆️
test/tuple_test.cpp	97.36% <0%> (-2.64%)	⬇️
test/serial_queue_test.cpp	91.34% <0%> (-0.97%)	⬇️
stlab/concurrency/channel.hpp	94.36% <0%> (-0.87%)	⬇️
... and 1 more

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