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

		if ( 'item_meta_array' === $offset || 'item_meta' === $offset ) {
			$this->meta_data = array();
			return;
		}

		if ( array_key_exists( $offset, $this->data ) ) {
			unset( $this->data[ $offset ] );
		}

		if ( array_key_exists( $offset, $this->changes ) ) {
			unset( $this->changes[ $offset ] );
		}

		$this->delete_meta_data( $offset );
	}