Logs handled by stdout displayed as error by StackDriver

[kfcaio]

I read somewhere that, by default, the log messages captured in stdout and stderr aren't captured with severity metadata. So, if I set stdout as the only handler of my application, then is it expected that google stackdriver displays every log as error, regardless its severity? I'd like to know if my hypothesis is true and some reference to docs about handlers. Thanks in advance : )