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my @sorted =
   ((sort {$order{$a} <=> $order{$b}}
   grep {exists $order{$_}} @to_be_ordered),
   grep {not exists $order{$_}} @to_be_ordered);

my (@exists, @not_exists);
push @{exists $order{$_} ? \@exists : \@not_exists }, $_ for @to_be_or
+dered;
my @sorted = ((sort {$order{$a} <=> $order{$b}} @exists), @not_exists)
+;