The tied hash will only do its magic if you do an operation that calls one of the magic functions. You're not doing any kind of hash-store, you're just operating on values that are referenced. This should (IMO) work: 
   foreach $val (@{$memrevmap{$key}}) {
      print "pushing into $key, $val\n";
      $revmap{$key}=[@{$revmap{$key}}, $val];
   }

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In reply to Re: pushing into a tie'd hash by Roy Johnson
in thread pushing into a tie'd hash by mast

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