# $name is somehow derived from the object value we're storing.  The
# details of that are (probably) unimportant.
$name = $key_obj->derive_name($obj);

# insert to cache:
$cache{$name} = $obj->value();

# insert to cache with possible collision:
$cache{$key_obj->object_ID() . $name} = $obj->value();

# remove from cache:
$value = $cache{$name};

# remove from cache with possible collision:
$value = $cache{$key_obj->object_ID() . $name};