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$myHash{"uno"} = "one";
$myHash{"dos"} = "two";
...
$myHash{"tres"}->[1] = "three-point-one";
$myHash{"tres"}->[2] = "three-point-two";
$myHash{"quatro"} = "four";

@myArray = @{$myHash{"tres"}};   #DeRef & Copy to @myArray

$myArray[3] = "three-point-three";
$myArray[4] = "three-point-four";

@{$myHash{"tres"}} =  @myArray;    #Copies Array to Hash
$myHash{"tres"} =  \@myArray;      #Copies Ref to Hash

\@myArray = $myHash{"tres"};