Preserve seek time and other parameters to amp-youtube from YouTube embeds

.github/workflows/build-test-measure.yml

@@ -214,6 +214,7 @@ jobs:
           # phpstan requires PHP 7.1+.
           php-version: 7.4
           extensions: dom, iconv, json, libxml, zip
+          tools: phpstan
 
       - name: Get Composer Cache Directory
         id: composer-cache
@@ -231,7 +232,9 @@ jobs:
         run: composer install
 
       - name: Static Analysis (PHPStan)
-        run: vendor/bin/phpstan analyse
+        run: |
+          phpstan --version
+          phpstan analyse
 
 #-----------------------------------------------------------------------------------------------------------------------
 

includes/embeds/class-amp-base-embed-handler.php

@@ -21,7 +21,9 @@ abstract class AMP_Base_Embed_Handler {
 	/**
 	 * Default width.
 	 *
-	 * @var int
+	 * In some cases, this may be the string 'auto' when a fixed-height layout is used.
+	 *
+	 * @var int|string
 	 */
 	protected $DEFAULT_WIDTH = 600;