perl -E '
use v5.36;
use overload q{%{}} => sub { { foo => 1 } };
sub foo { $_[0]->$*->{foo} }
my $x= bless \{ foo => 2 }, "main";
say $x->foo;
'

##</code><code>##

perl -E '
use v5.36;
use Scalar::Util "refaddr";
use overload q{%{}} => sub { { foo => 1 } };
our %attrs;
sub new { my $self= bless {}, shift; $attrs{refaddr $self}= { @_ }; $self }
sub DESTROY { delete $attrs{refaddr $_[0]} }
sub foo { $attrs{refaddr $_[0]}{foo} }
my $x= main->new(foo => 2);
say $x->foo;
'