Ban foreach(arrayWithStringKeys as k => v)

this is not as good as phpstan/phpstan-src#769 (e.g. array_key_first()/array_key_last() aren't covered by this, nor is array_rand()) but it does eliminate the most infuriating cases where this usually crops up.

src/MemoryManager.php

@@ -368,7 +368,7 @@ class MemoryManager{
 				'_SESSION' => true
 			];
 
-			foreach($GLOBALS as $varName => $value){
+			foreach(Utils::stringifyKeys($GLOBALS) as $varName => $value){
 				if(isset($ignoredGlobals[$varName])){
 					continue;
 				}