diff -r 3d4e9c994f10 -r a86126ab1dd4 wp/wp-includes/sodium_compat/autoload.php
--- a/wp/wp-includes/sodium_compat/autoload.php	Tue Oct 22 16:11:46 2019 +0200
+++ b/wp/wp-includes/sodium_compat/autoload.php	Tue Dec 15 13:49:49 2020 +0100
@@ -43,7 +43,17 @@
     // unless PHP >= 5.3.0
     require_once dirname(__FILE__) . '/lib/namespaced.php';
     require_once dirname(__FILE__) . '/lib/sodium_compat.php';
+} else {
+    require_once dirname(__FILE__) . '/src/PHP52/SplFixedArray.php';
 }
 if (PHP_VERSION_ID < 70200 || !extension_loaded('sodium')) {
-    require_once dirname(__FILE__) . '/lib/php72compat.php';
+    if (PHP_VERSION_ID >= 50300 && !defined('SODIUM_CRYPTO_SCALARMULT_BYTES')) {
+        require_once dirname(__FILE__) . '/lib/php72compat_const.php';
+    }
+    if (PHP_VERSION_ID >= 70000) {
+        assert(class_exists('ParagonIE_Sodium_Compat'), 'Possible filesystem/autoloader bug?');
+    } else {
+        assert(class_exists('ParagonIE_Sodium_Compat'));
+    }
+    require_once (dirname(__FILE__) . '/lib/php72compat.php');
 }