Wrong output when piping to 'unexpand'

[rekolteur]

Hello,

I have a file with :

# PATH=$(echo -n $PATH | \
#        awk -v RS=: -v ORS=: '!x[$0]++' | \
#        sed "s/\(.*\).\{1\}/\1/")

# PS1='\h\$ '
PS1=k$\

if [ ! -d /tmp/alpha ]; then
        mkdir /tmp/alpha
        chmod 0700 /tmp/alpha

The command :
:%!unexpand -t4

unexpands correctly those lines (gives me 2 tabs after the '#' character):

#        awk -v RS=: -v ORS=: '!x[$0]++' | \
#        sed "s/\(.*\).\{1\}/\1/")

but does not unexpands those lines (still 8 spaces):

        mkdir /tmp/alpha
        chmod 0700 /tmp/alpha

I also tested with
:%!unexpand -a -t4

I have no such problems with vim, nvi (provided by voidlinux) and in CLI (unexpand -t4 file.txt > alpha.txt ; alpha.txt has the correct tabs).

Thank you and keep up the great job!

EDIT

I had set expandtab in $HOME/.nexrc when I did my tests.
If I disable this option, then :%!unexpand -t4 works as expected.

I can live with that, one just has to have it in mind.