if data is not ascii, we'll convert them to unicode #31
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Current implementation transfers unicode string to str string during serialization and deserialization
https://github.com/ros/ros_comm/pull/530/files#diff-6907356c07d5398105854fc29f684d12R228
https://github.com/ros/ros_comm/pull/530/files#diff-6907356c07d5398105854fc29f684d12R232
I think this is current specification, but just in case this is bug, here is the fix for that.
If we accept this patch, we have to fix test code ros/ros_comm#530