can't unalias global

[Atom Smasher <atom@xxxxxxxxxxx>]

as seen below, i can unset a command alias, but not a global alias. any 
ideas? thanks...

% alias foo=bar

% alias -g zsh-dir=/usr/ports/shells/zsh

% alias
foo=bar
rm='rm -i'
run-help=man
which-command=whence
zsh-dir=/usr/ports/shells/zsh

% unalias foo

% unalias zsh
unalias: no such hash table element: zsh

% unhash -a zsh
unhash: no such hash table element: zsh

% alias
rm='rm -i'
run-help=man
which-command=whence
zsh-dir=/usr/ports/shells/zsh


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	"If you step back and look at the data, the optimum amount of
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		correlation between red meat consumption and
		colon cancer.