[perl #60572] can`t set attribute-array for object in .new

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# New Ticket Created by  Ilya Belikin 
# Please include the string:  [perl #60572]
# in the subject line of all future correspondence about this issue. 
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Hi!
example:

class Foo {
    has @.a;
}
my @b = 1,2,3;

my $f = Foo.new(a => @b);
$f.a.perl.say; # []

$f = Foo.new( :a(1,2,3) );
$f.a.perl.say; # []

$f = Foo.new( :a([1,2,3]) );
$f.a.perl.say; # []

Thank you!
Ilya