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Every time a command I issue from iTerm2 takes longer than a minute to complete, a null character ^@ gets printed out once for every minute or so continuously until the process completes.
I can’t figure out if this is a bug or a feature that I should somehow be able to disable.
It actually seems to print out to the terminal, but it is not going to either stdout or stderr:
$ echo `sleep 181`
^@^@
$ echo `sleep 181` 2> /tmp/stderr
^@^@
$ echo `sleep 181` > /tmp/stdout
^@^@
Turn off “when idle send ascii code” in prefs->profiles->session.