Add new $pages->cache()->hasCache($page_id) method

wire/core/PagesLoaderCache.php

@@ -91,6 +91,18 @@ class PagesLoaderCache extends Wire {
 		return $page;
 	}
 
+	/**
+	 * Is given page ID in the cache?
+	 * 
+	 * @param int page ID
+	 * @return bool
+	 * @since 3.0.243
+	 * 
+	 */
+	public function hasCache($id) {
+		return isset($this->pageIdCache[$id]);
+	}
+
 	/**
 	 * Cache the given page.
 	 *