option for guaranteed auto cleanup using file descriptor trick

[timotheecour]

this answer uses a nice trick to guarantee auto cleanup:

tmpfile=$(mktemp /tmp/abc-script.XXXXXX)
exec 3>"$tmpfile"
rm "$tmpfile"
: ...
echo foo >&3

the cleanup would happen even if a crash happens (or, say, a quit):

When it gets closed (which the kernel does automatically when the process exits) the filesystem deletes the file

the same trick could be used (as option!) in tempfile API

[ba0f3]

thank you!