Merged in feature/from-pantheon (pull request #16)

code from pantheon

* code from pantheon

wp/wp-content/plugins/wordpress-seo/src/analytics/domain/missing-indexable-bucket.php

@@ -0,0 +1,48 @@
+<?php
+
+namespace Yoast\WP\SEO\Analytics\Domain;
+
+/**
+ * A collection domain object.
+ */
+class Missing_Indexable_Bucket {
+
+	/**
+	 * All the missing indexable count objects.
+	 *
+	 * @var array<Missing_Indexable_Count>
+	 */
+	private $missing_indexable_counts;
+
+	/**
+	 * The constructor.
+	 */
+	public function __construct() {
+		$this->missing_indexable_counts = [];
+	}
+
+	/**
+	 * Adds a missing indexable count object to this bucket.
+	 *
+	 * @param Missing_Indexable_Count $missing_indexable_count The missing indexable count object.
+	 *
+	 * @return void
+	 */
+	public function add_missing_indexable_count( Missing_Indexable_Count $missing_indexable_count ): void {
+		$this->missing_indexable_counts[] = $missing_indexable_count;
+	}
+
+	/**
+	 * Returns the array representation of all indexable counts.
+	 *
+	 * @return array
+	 */
+	public function to_array() {
+		return \array_map(
+			static function ( $item ) {
+				return $item->to_array();
+			},
+			$this->missing_indexable_counts
+		);
+	}
+}