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sub fubar {
   my %hash = @_;
...
}
...
fubar(%{$arrayofhashes[$index]});

sub fubar {
   my $hashref = shift;
...
}
...
fubar($arrayofhashes[$index]);

sub fubar(%) {
   my $hashref = shift;
...
}
...
fubar(%{$arrayofhashes[$index]});