In any other shell, stderr is inherited like normal, and only piped if you
request it explicitly (e.g., `2>/dev/null`). In the case of a command like
`fzf`, stderr is used for the interactive selection of files. By piping it,
something like
fzf | xargs echo
does not work. By removing all stderr piping we eliminate this issue. We can
return later with a way to deal with stderr piping when an actual use case
arises.
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