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prefix and join an array

Hello.

Is it possible to prefix and join an array:

% list=(a.tld b.tld c.tld)
% tmp=(DNS:${^list})
% print ${(j., .)tmp}
DNS:a.tld, DNS:b.tld, DNS:c.tld

but directly, without tmp, something like:

% print ${(j., .)(DNS:${^list})}


-- 
sergio.
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