Backport type fixes

Author: nicolas-grekas

Caster/LinkStub.php

@@ -23,7 +23,7 @@ class LinkStub extends ConstStub
     private static $vendorRoots;
     private static $composerRoots;
 
-    public function __construct($label, int $line = 0, $href = null)
+    public function __construct(string $label, int $line = 0, string $href = null)
     {
         $this->value = $label;
 

Caster/ResourceCaster.php

@@ -48,7 +48,7 @@ public static function castProcess($process, array $a, Stub $stub, $isNested)
     public static function castStream($stream, array $a, Stub $stub, $isNested)
     {
         $a = stream_get_meta_data($stream) + static::castStreamContext($stream, $a, $stub, $isNested);
-        if (isset($a['uri'])) {
+        if ($a['uri'] ?? false) {
             $a['uri'] = new LinkStub($a['uri']);
         }
 

Caster/SplCaster.php

@@ -129,7 +129,7 @@ public static function castFileInfo(\SplFileInfo $c, array $a, Stub $stub, $isNe
             }
         }
 
-        if (isset($a[$prefix.'realPath'])) {
+        if ($a[$prefix.'realPath'] ?? false) {
             $a[$prefix.'realPath'] = new LinkStub($a[$prefix.'realPath']);
         }
 

Dumper/HtmlDumper.php

@@ -998,7 +998,7 @@ private function getSourceLink(string $file, int $line)
     }
 }
 
-function esc($str)
+function esc(string $str)
 {
     return htmlspecialchars($str, \ENT_QUOTES, 'UTF-8');
 }

Server/Connection.php

@@ -78,7 +78,7 @@ public function write(Data $data): bool
         return false;
     }
 
-    private static function nullErrorHandler($t, $m)
+    private static function nullErrorHandler(int $t, string $m)
     {
         // no-op
     }