public function offsetGet( $offset ) {
		$this->maybe_read_meta_data();

		if ( 'item_meta_array' === $offset ) {
			$return = array();

			foreach ( $this->meta_data as $meta ) {
				$return[ $meta->id ] = $meta;
			}

			return $return;
		}

		$meta_values = wp_list_pluck( $this->meta_data, 'value', 'key' );

		if ( 'item_meta' === $offset ) {
			return $meta_values;
		} elseif ( 'type' === $offset ) {
			return $this->get_type();
		} elseif ( array_key_exists( $offset, $this->data ) ) {
			$getter = "get_$offset";
			if ( is_callable( array( $this, $getter ) ) ) {
				return $this->$getter();
			}
		} elseif ( array_key_exists( '_' . $offset, $meta_values ) ) {
			// Item meta was expanded in previous versions, with prefixes removed. This maintains support.
			return $meta_values[ '_' . $offset ];
		} elseif ( array_key_exists( $offset, $meta_values ) ) {
			return $meta_values[ $offset ];
		}

		return null;
	}