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sub two_pass {
    my @sorted =
...
        sort { $a->name cmp $b->name }
        @employees;
}

            Rate    obvious     subtle   two_pass functional
obvious    173/s         --       -22%       -30%       -61%
subtle     222/s        28%         --       -11%       -50%
two_pass   249/s        44%        12%         --       -44%
functional 444/s       156%       100%        79%         --

use v6;
class Person {
...
    .sort.map(*.value.sort(*.name));

say .perl for @sorted;

Person.new(name => "Alice", title => "Sales Manager")
Person.new(name => "Carol", title => "Marketing Manager")
...
Person.new(name => "Dave", title => "Janitor")
Person.new(name => "Eve", title => "Tech Support")
Person.new(name => "Fred", title => "Receptionist")