passing hash ref to a function

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my %hash = (
    'animal' => 'bear',
...
    $ref_hash{'new'} = 'new_v';
    print join(",", keys (%ref_hash)),"\n";
}

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plant,new,fungus,animal                                               
+                                                                     
+                                        
plant,animal,fungus

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plant,new,fungus,animal                                               
+                                                                     
+                                        
plant,new,fungus,animal

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