PHPLIB-1564: Increase batchSize for find when it's equal to limit

Author: alcaeus

src/Operation/Find.php

@@ -30,6 +30,7 @@
 use MongoDB\Exception\UnsupportedException;
 use MongoDB\Model\CodecCursor;
 
+use function assert;
 use function is_array;
 use function is_bool;
 use function is_integer;
@@ -418,6 +419,12 @@ private function createQueryOptions(): array
             $options['modifiers'] = is_object($modifiers) ? document_to_array($modifiers) : $modifiers;
         }
 
+        // Ensure no cursor is left behind when limit == batchSize by increasing batchSize
+        if (isset($options['limit'], $options['batchSize']) && $options['limit'] === $options['batchSize']) {
+            assert(is_integer($options['batchSize']));
+            $options['batchSize']++;
+        }
+
         return $options;
     }
 }