Are you aware of the other common idioms for this sort of thing? 
%hash = (%hash, @more);

%hash = (%hash, %more);

@hash{@keys} = @values;

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Your hash join can be rewritten in the first form, though I usually try to arrange things so that the last one is possible. 
   MeowChow                                   
               s aamecha.s a..a\u$&owag.print

In reply to Re: join should polymorph on hashes by MeowChow
in thread join should polymorph on hashes by princepawn

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