Bash completion: errors when IFS is newline

[avidseeker]

~/.bashrc:

IFS=$'\n'
. /usr/share/fzf/completion.bash

Result:

bash: complete:  default -o bashdefault: invalid option name
bash: complete:  default -o bashdefault: invalid option name
bash: complete:  default -o bashdefault: invalid option name
bash: complete:  default -o bashdefault: invalid option name
bash: complete:  default -o bashdefault: invalid option name
bash: complete:  default -o bashdefault: invalid option name
bash: complete:  default -o bashdefault: invalid option name
bash: complete:  default -o bashdefault: invalid option name
bash: complete:  bashdefault -o nospace -o dirnames: invalid option name
bash: complete:  default -o nospace -v: invalid option name
bash: complete:  default -o bashdefault: invalid option name
bash: complete:  default -o bashdefault: invalid option name

See discussion: gokcehan/lf#1947 and zsh-users/zsh-autosuggestions#825