public function update_meta_data( $key, $value, $meta_id = 0 ) {
		if ( $this->is_internal_meta_key( $key ) ) {
			$function = 'set_' . $key;

			if ( is_callable( array( $this, $function ) ) ) {
				return $this->{$function}( $value );
			}
		}

		$this->maybe_read_meta_data();

		$array_key = false;

		if ( $meta_id ) {
			$array_keys = array_keys( wp_list_pluck( $this->meta_data, 'id' ), $meta_id, true );
			$array_key  = $array_keys ? current( $array_keys ) : false;
		} else {
			// Find matches by key.
			$matches = array();
			foreach ( $this->meta_data as $meta_data_array_key => $meta ) {
				if ( $meta->key === $key ) {
					$matches[] = $meta_data_array_key;
				}
			}

			if ( ! empty( $matches ) ) {
				// Set matches to null so only one key gets the new value.
				foreach ( $matches as $meta_data_array_key ) {
					$this->meta_data[ $meta_data_array_key ]->value = null;
				}
				$array_key = current( $matches );
			}
		}

		if ( false !== $array_key ) {
			$meta        = $this->meta_data[ $array_key ];
			$meta->key   = $key;
			$meta->value = $value;
		} else {
			$this->add_meta_data( $key, $value, true );
		}
	}