Please instead use:

    if(  UNIVERSAL::isa( $hash{$key}, "ARRAY" )  ) {
        dosomething(  @{ $hash{$key} }  );
    } else {
        dosomething(  $hash{$key}  );
    }
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This makes your code work for non-ordinary array references.

        - tye (but my friends call me "Tye")