Nginx stop function in service file

[B.R.]

I am using the official Debian package (stable) and I noticed the service
file, in its do_stop() function, sends SIGTERM to the master process.

However, the docs say SIGTERM (and SIGQUIT) sent to the master process
provokes a 'fast shutdown' whereas SIGQUIT would provoke a 'graceful
shutdown'.

Why is not SIGQUIT being used? What is the difference between those
termination signals, speaking of nginx behavior?

Thanks,
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*B. R.*
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