When I use :a, :A or :P on a symlink whose destination does not exist, I do
not get the output I'm expecting:

% touch foo
% ln -s foo bar
% print bar(:P)
/private/var/folders/hk/lcsr76092ygbtc8y1fryg7jh0000gn/T/tmp.ir6Iuz7K/foo
% rm foo
% print bar(:P)
/private/var/folders/hk/lcsr76092ygbtc8y1fryg7jh0000gn/T/tmp.ir6Iuz7K/bar
%

How can I consistently resolve a symlink's destination, regardless of
whether it exists?

I know I can use readlink for this, but is there any way to do this with
Zsh?