Refactor Client class to remove null value checks in document processing

This update simplifies the handling of document updates by allowing null values to be included, removing unnecessary checks for null values in the Client class methods.

Author: shimonewman

src/Client.php

@@ -461,10 +461,6 @@ public function insert(string $collection, array $document, array $options = [])
         $docObj = new stdClass();
 
         foreach ($document as $key => $value) {
-            if (\is_null($value)) {
-                continue;
-            }
-
             $docObj->{$key} = $value;
         }
 
@@ -486,10 +482,6 @@ public function insertMany(string $collection, array $documents, array $options
             $docObj = new stdClass();
 
             foreach ($document as $key => $value) {
-                if (\is_null($value)) {
-                    continue;
-                }
-
                 $docObj->{$key} = $value;
             }
 
@@ -540,22 +532,14 @@ public function lastDocument(string $collection): array
      */
     public function update(string $collection, array $where = [], array $updates = [], array $options = [], bool $multi = false): self
     {
-        $cleanUpdates = [];
-
-        foreach ($updates as $k => $v) {
-            if (\is_null($v)) {
-                continue;
-            }
-            $cleanUpdates[$k] = $v;
-        }
-
+        
         $this->query(
             array_merge([
                 self::COMMAND_UPDATE => $collection,
                 'updates' => [
                     [
                         'q' => $this->toObject($where),
-                        'u' => $this->toObject($cleanUpdates),
+                        'u' => $this->toObject($updates),
                         'multi' => $multi,
                         'upsert' => false
                     ]
@@ -582,16 +566,9 @@ public function upsert(string $collection, array $operations, array $options = [
         $updates = [];
 
         foreach ($operations as $op) {
-            $cleanUpdate = [];
-            foreach ($op['update'] as $k => $v) {
-                if (!is_null($v)) {
-                    $cleanUpdate[$k] = $v;
-                }
-            }
-
             $updateOperation = [
                 'q' => $op['filter'],
-                'u' => $this->toObject($cleanUpdate),
+                'u' => $this->toObject($op['update']),
                 'upsert' => true,
                 'multi' => isset($op['multi']) ? $op['multi'] : false,
             ];
@@ -897,12 +874,7 @@ private function cleanFilters($filters): array
 
             if (in_array($k, ['$and', '$or', '$nor']) && is_array($v)) {
                 $values = [];
-
                 foreach ($v as $item) {
-                    if (is_null($item)) {
-                        continue;
-                    }
-
                     $values[] = is_array($item) ? $this->toObject($item) : $item;
                 }