Adding type-hints to json_decode

Author: moufmouf

.travis.yml

@@ -31,6 +31,7 @@ script:
 - cd generator && ./vendor/bin/phpunit && cd ..
 - cd generator && composer cs-check && cd ..
 - cd generator && composer phpstan && cd ..
+- composer dump-autoload
 - composer cs-check
 - composer phpstan
 # Now, let's regenerate all files and see if we obtain the same set of files as the ones commited:

lib/special_cases.php

@@ -22,7 +22,7 @@
  * @throws JsonException if the JSON cannot be decoded.
  * @link http://www.php.net/manual/en/function.json-decode.php
  */
-function json_decode($json, $assoc = false, $depth = 512, $options = 0)
+function json_decode(string $json, bool $assoc = false, int $depth = 512, int $options = 0)
 {
     $data = \json_decode($json, $assoc, $depth, $options);
     if (JSON_ERROR_NONE !== json_last_error()) {