Themes: Account for a numeric theme directory in `WP_Theme::__construct()`.

This ensures that if a theme with a numeric directory name is active, it is correctly identified as such, and that theme support features work as expected.

Follow-up to [20029], [49925].

Props lopo, alvastar, winterpsv, hugodevos, ankit-k-gupta, jakariaistauk, mukesh27, spacedmonkey, SergeyBiryukov.
Fixes #54645.
Built from https://develop.svn.wordpress.org/trunk@55426


git-svn-id: http://core.svn.wordpress.org/trunk@54959 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-theme.php

@@ -242,6 +242,9 @@ final class WP_Theme implements ArrayAccess {
 			}
 		}
 
+		// Handle a numeric theme directory as a string.
+		$theme_dir = (string) $theme_dir;
+
 		$this->theme_root = $theme_root;
 		$this->stylesheet = $theme_dir;
 

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.2-beta3-55425';
+$wp_version = '6.2-beta3-55426';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.