Specifically, some warnings were recently introduced into `test_subscriber.cpp`: ``` 'argument': conversion from 'double' to 'int32_t', possible loss of data ``` * Linux [](http://ci.ros2.org/job/ci_linux/5592/) * Linux-aarch64 [](http://ci.ros2.org/job/ci_linux-aarch64/2226/) * macOS [](http://ci.ros2.org/job/ci_osx/4602/) * Windows [](http://ci.ros2.org/job/ci_windows/5471/)