Do not try to serialize documents during insert

Author: anahan

src/JaegerMongoDbCommandConvertor.php

@@ -116,7 +116,7 @@ private function transformUpdateDelete(object $op): string
                     $tVal = $this->transformQuery($v);
                     break;
                 default:
-                    $tVal = json_encode($v);
+                    $tVal = \json_encode($v);
             }
 
             $result .= $k . ': ' . $tVal . ', ';
@@ -145,17 +145,20 @@ public function convert(object $command): string
                     $tVal = $this->transformUpdatesDeletes($v);
                     break;
 
+                case 'documents':
+                    $tVal = '[' . \substr(\str_repeat('?,', \count($v)), 0, -1) . ']';
+                    break;
+
                 case 'query':
                 case 'filter':
-                case 'documents':
                     $tVal = $this->transformQuery($v);
                     break;
 
                 case 'writeConcern':
                     $tVal = $this->serializeWriteConcern($v);
                     break;
                 default:
-                    $tVal = json_encode($v);
+                    $tVal = \json_encode($v);
             }
 
             if ('' === $tVal) {