Some people for param lists do, 
my %localdog;
if(@_ == 2  && ref($_[1]) eq 'HASH') {
#named params
     my $hvref = $_[1];
     $localdog{name} = $hvref->{name};
     $localdog{color} = $hvref->{color};
}
else{
     $localdog{name} = $_[1];
     $localdog{color} = $_[2];
}

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In reply to Re^3: xs modifying passed value by bulk88
in thread xs modifying passed value by Festus Hagen

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