use Hash::Ordered;
use MCE::Shared::Ordhash;

tie my %h1, 'Hash::Ordered', @pairs;
tie my %h2, 'MCE::Shared::Ordhash', @pairs;

my $h3 = Hash::Ordered->new( @pairs );
my $h4 = MCE::Shared::Ordhash->new( @pairs );