# Done with `auto_deref => 1`
 @list = $obj-> prop;

 # Done with a custom writer attribute that takes an array, and stores a reference to it.
 # internally Moose uses a plain perl hash (most complex datastructure in perl), this 
 # limits it to not having true non-array properties (but a scalar array-ref works)
 $obj->prop(@list);

 # assuming you mean $arrayRef
 # Here the getter would have to call wantarray() which is exactly what auto_deref => 1
 # will set up for you.
 $array = $obj->prop;

 # assuming you mean $arrayRef, this already works so long as the type is ArrayRef
 # or, a parent thereof.
 $obj->prop($array);

##</code><code>##

sub foo_writer {
 if ( length @_ > 1 ) {
  \@_
 }
 else {
  die 'invalid arg' unless ref $_[0] eq 'ARRAY';
  $_[0];
 }
}