"Real" and fast lvalue-subs that are able to "see" the right value (for checking), not the crippled implementation as today.

Yes, this is for accessors like $object->foo = "bar";, I grew up with VB and $object->foo("bar";) simply doesn't feel right.

I know it can be done by returning tied hashes, but that is fat, slow and ugly and needs extra work. Thinking about it, why not a new keyword:

package blablabla;

sub new
{
  #...
}

property get foo
{
  return $self->{_foo};
}

property set foo
{
  my $foo = shift;
  $self->{_foo} = $foo;
}
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