feat: add support for JSON_FORCE_OBJECT option in json normalizer

src/Normalizer/Formatter/JsonFormatter.php

@@ -43,12 +43,6 @@ public function format(mixed $value): void
  */
  $this->write(json_encode($value, $this->jsonEncodingOptions));
  } elseif (is_iterable($value)) {
- if ($value === [] && $this->jsonEncodingOptions & JSON_FORCE_OBJECT) {
- $this->write('{}');
-
- return;
-
- }
  // Note: when a generator is formatted, it is considered as a list
  // if its first key is 0. This is done early because the first JSON
  // character for an array differs from the one for an object, and we
@@ -58,8 +52,11 @@ public function format(mixed $value): void
  // afterward, this leads to a JSON array being written, while it
  // should have been an object. This is a trade-off we accept,
  // considering most generators starting at 0 are actually lists.
- $isList = ($value instanceof Generator && $value->key() === 0)
- || (is_array($value) && array_is_list($value));
+ $isList = ! ($this->jsonEncodingOptions & JSON_FORCE_OBJECT)
+ && (
+ ($value instanceof Generator && $value->key() === 0)
+ || (is_array($value) && array_is_list($value))
+ );
 
  $isFirst = true;