can-i-modify-values-as-i-classify-a-perl-6-list
my @list = (
<Camelia 5>,
<Camelia 6>,
<Camelia 7>,
<Amelia 1>,
<Amelia 2>,
<Amelia 3>
);
my %hash = @list.classify: *.[0], as => *.[1];
say %hash; # {Amelia => [1 2 3], Camelia => [5 6 7]}
@list.classify: *.[0], :into(my %h), :as( *.[1] );
