[FFmpeg-user] request for review: feature request of "disallow unallowed bitrates"

[Roger Pack]

Hello all.
It's come to my attention that ffmpeg accepts parameters like this:
$ ffmpeg -i in.mp3 -b:a 40000k out.mp3

(it ends up writing it as a 320 Kb/s audio bitrate--not the specified
"impossible" number).

Similarly.
$ ffmpeg -i in.mp3 -b:a 310k out.mp3

seemingly "magically" produces a file with 320 Kb/s bitrate--not 310)

So I was thinking of filing a trac with a request to at least "warn"
when it ends up picking some bitrate other than that specified.
Any feedback before I do so?
Thanks.
-r