Address query encoding review feedback

Author: Bennett-hash

src/Parse/ParseQuery.php

@@ -181,8 +181,8 @@ private function isConditionMap($value)
             return false;
         }
 
-        foreach (array_keys($value) as $key) {
-            if (!is_string($key) || strpos($key, '$') !== 0) {
+        foreach ($value as $operatorKey => $_) {
+            if (!is_string($operatorKey) || strpos($operatorKey, '$') !== 0) {
                 return false;
             }
         }

tests/Parse/ParseQueryTest.php

@@ -2830,7 +2830,7 @@ public function testEqualToAfterDirectEqualityDoesNotOverrideOtherConditions()
     /**
      * @group query-equalTo-conditions
      */
-    public function testEqualToPointerUsesDirectEqualityForArrayFieldMembership()
+    public function testEqualToPointerSerializesAsDirectWhereValue()
     {
         $user = new ParseObject('_User');
         $user->_mergeAfterFetch([