Merge branch '5.3' into 5.4

* 5.3:
  [Process] intersect with getenv() in case-insensitive manner to get default envs
  [Serializer] fix support for lazy/unset properties
  Fix redundant type casts
  [Notifier] Fix AllMySms bridge body content
  Revert "[DoctrineBridge] add support for the JSON type"

Resource/ClassExistenceResource.php

@@ -38,7 +38,7 @@ public function __construct(string $resource, bool $exists = null)
     {
         $this->resource = $resource;
         if (null !== $exists) {
-            $this->exists = [(bool) $exists, null];
+            $this->exists = [$exists, null];
         }
     }
 

Util/XmlUtils.php

@@ -239,12 +239,12 @@ public static function phpize($value)
                 $raw = $value;
                 $cast = (int) $value;
 
-                return '0' == $value[0] ? octdec($value) : (((string) $raw === (string) $cast) ? $cast : $raw);
+                return '0' == $value[0] ? octdec($value) : (($raw === (string) $cast) ? $cast : $raw);
             case isset($value[1]) && '-' === $value[0] && ctype_digit(substr($value, 1)):
                 $raw = $value;
                 $cast = (int) $value;
 
-                return '0' == $value[1] ? octdec($value) : (((string) $raw === (string) $cast) ? $cast : $raw);
+                return '0' == $value[1] ? octdec($value) : (($raw === (string) $cast) ? $cast : $raw);
             case 'true' === $lowercaseValue:
                 return true;
             case 'false' === $lowercaseValue: