SYNOPSIS
  package Foo;
  use accessors::rw qw( foo bar baz );
  my $obj = bless {}, 'Foo';
  # always return the current value, even on set:
  $obj->foo( 'hello ' ) if $obj->bar( 'world' ) eq 'world';
  print $obj->foo, $obj->bar, $obj->baz( "!\n" );

