[oftheoaks]

This is really interesting. The case pointed out in Ex.3 is pretty hilarious:

(from the bash manual)

              The ERR trap [same rules as set -e] is not executed if the
              failed command is part of the command list immediately following
              a  while  or until keyword, part of the test in an if statement,
              part of a command executed in a && or || list except the command
              following the final && or || [...]