Install stable latest phpstan. Be strict about input values

Author: andrew-demb

composer.json

@@ -25,7 +25,7 @@
   "require-dev": {
     "phpunit/phpunit": "^8.4.1",
     "mouf/picotainer": "^1.1",
-    "phpstan/phpstan": "^0.12.99",
+    "phpstan/phpstan": "^1.8.2",
     "php-coveralls/php-coveralls": "^2.1.0",
     "symfony/translation": "^4",
     "doctrine/coding-standard": "^9.0"

src/Annotations/Assertion.php

@@ -8,7 +8,9 @@
 use Symfony\Component\Validator\Constraint;
 use TheCodingMachine\GraphQLite\Annotations\ParameterAnnotationInterface;
 
+use function assert;
 use function is_array;
+use function is_string;
 use function ltrim;
 
 /**
@@ -41,8 +43,22 @@ public function __construct(array $values)
             throw new BadMethodCallException('The @Assert annotation must be passed one or many constraints. For instance: "@Assert(for="$email", constraint=@Email)"');
         }
 
-        $this->for = ltrim($values['for'], '$');
-        $this->constraint = is_array($values['constraint']) ? $values['constraint'] : [$values['constraint']];
+        assert(is_string($values['for']));
+        $for = ltrim($values['for'], '$');
+
+        $constraints = [];
+        if (is_array($values['constraint'])) {
+            foreach ($values['constraint'] as $constraint) {
+                assert($constraint instanceof Constraint);
+                $constraints[] = $constraint;
+            }
+        } else {
+            assert($values['constraint'] instanceof Constraint);
+            $constraints = [$values['constraint']];
+        }
+
+        $this->for = $for;
+        $this->constraint = $constraints;
     }
 
     public function getTarget(): string