Add invalid argument exception

src/Exception/InvalidArgumentException.php

@@ -0,0 +1,5 @@
+<?php
+
+namespace GuzzleHttp\Exception;
+
+final class InvalidArgumentException extends \InvalidArgumentException implements GuzzleException {}

src/functions.php

@@ -294,14 +294,14 @@ function is_host_in_noproxy($host, array $noProxyArray)
  * @param int    $options Bitmask of JSON decode options.
  *
  * @return mixed
- * @throws \InvalidArgumentException if the JSON cannot be decoded.
+ * @throws Exception\InvalidArgumentException if the JSON cannot be decoded.
  * @link http://www.php.net/manual/en/function.json-decode.php
  */
 function json_decode($json, $assoc = false, $depth = 512, $options = 0)
 {
     $data = \json_decode($json, $assoc, $depth, $options);
     if (JSON_ERROR_NONE !== json_last_error()) {
-        throw new \InvalidArgumentException(
+        throw new Exception\InvalidArgumentException(
             'json_decode error: ' . json_last_error_msg()
         );
     }
@@ -317,14 +317,14 @@ function json_decode($json, $assoc = false, $depth = 512, $options = 0)
  * @param int    $depth   Set the maximum depth. Must be greater than zero.
  *
  * @return string
- * @throws \InvalidArgumentException if the JSON cannot be encoded.
+ * @throws Exception\InvalidArgumentException if the JSON cannot be encoded.
  * @link http://www.php.net/manual/en/function.json-encode.php
  */
 function json_encode($value, $options = 0, $depth = 512)
 {
     $json = \json_encode($value, $options, $depth);
     if (JSON_ERROR_NONE !== json_last_error()) {
-        throw new \InvalidArgumentException(
+        throw new Exception\InvalidArgumentException(
             'json_encode error: ' . json_last_error_msg()
         );
     }