This file is indexed.

/usr/share/zsh/functions/Zftp/zfls is in zsh-common 5.4.2-3ubuntu3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# function zfls {

emulate -L zsh
[[ $curcontext = :zf* ]] || local curcontext=:zfls

# directory hack, see zfcd
if [[ $1 = $HOME || $1 = $HOME/* ]]; then
  1="~${1#$HOME}"
fi

zfautocheck -d

zftp ls $*
# }