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Date: Sat, 11 Jan 2014 17:18:34 -0500
From: Eric Cook <llua@gmx.com>
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To: zsh-users@zsh.org
Subject: Trailing whitespace after $'\0' with external commands
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I've noticed trailing whitespace is ignored when it appears immediately
after $'\0'. i am unsure if this is intended behavior or not.

% zsh -c "/usr/bin/printf '<%s>' $'\0'' '; echo"
<>
% zsh -c "printf '<%s>' $'\0'' '; echo"
< >
% ksh93 -c "/usr/bin/printf '<%s>' $'\0'' '; echo"
< >
% ksh93 -c "printf '<%s>' $'\0'' '; echo"
<
>                                                                                                    

% ksh93 -c "type printf"
printf is a shell builtin
%

If the whitespace appears before the $'\0', it prints.
% zsh -c "/usr/bin/printf '<%s>' ' '$'\0'; echo"
< >
% zsh -c "printf '<%s>' ' '$'\0'; echo"
< >