Most people use Bash trap incorrectly, and it should be documented.

    # All normal and error exits

    trap 'e=$?; trap - EXIT; your cleanup here; exit $e' EXIT

    # Error only trap

    trap 'e=$?; trap - ERR; your error only cleanup here; exit $e' ERR

Save the previous exit condition to preserve it, otherwise it will be destroyed.

Untrapping is necessary to prevent multiple calls, especially if it can call exit or fail within the trap handler.

You don't need an exhaustive list of signals, which is almost never correct in oft touted cargo culted examples.