Double bacon strikes again

gistfile1.txt

 745         elsif $primitive eq 'type_new' {
 746             $constant := $type_obj.new(|@value, |%named);
 747             say("constant: ", $constant);
 748             $des := PAST::Op.new(
 749                 :pasttype('callmethod'), :name('new'),
 750                 $type_obj_lookup
 751             );
 752             say("constant1.2: ", $constant);


Called with:
 247         my $cheatpast := $*ST.add_constant('Str', 'str', 'bacon');
 248         say("creating an array");
 249         my $content   := $*ST.add_constant(
 250             'Array', 'type_new', $cheatpast<compile_time_value>
 251         );
 252         say("produced: ", $content<compile_time_value>);

Output:
creating an array
cache_key: Array,type_new,bacon
constant: bacon
constant1.2: bacon bacon

Somehow, line 748 of the first snippet duplicates the array element.