public function offsetSet( $offset, $value ) {
		if ( 'item_meta_array' === $offset ) {
			foreach ( $value as $meta_id => $meta ) {
				$this->update_meta_data( $meta->key, $meta->value, $meta_id );
			}
			return;
		}

		if ( array_key_exists( $offset, $this->data ) ) {
			$setter = "set_$offset";
			if ( is_callable( array( $this, $setter ) ) ) {
				$this->$setter( $value );
			}
			return;
		}

		$this->update_meta_data( $offset, $value );
	}