[TASK] Use native type declarations in Anchor (#1141)

Part of #811

Author: oliverklee

CHANGELOG.md

@@ -32,7 +32,7 @@ Please also have a look at our
 - Make all non-private properties `@internal` (#886)
 - Use more native type declarations and strict mode
   (#641, #772, #774, #778, #804, #841, #873, #875, #891, #922, #923, #933, #958,
-  #964, #967, #1000, #1044, #1134, #1136, #1137, #1139, #1140)
+  #964, #967, #1000, #1044, #1134, #1136, #1137, #1139, #1140, #1141)
 - Add visibility to all class/interface constants (#469)
 
 ### Deprecated

src/Parsing/Anchor.php

@@ -10,7 +10,7 @@
 class Anchor
 {
     /**
-     * @var int
+     * @var int<0, max>
      */
     private $position;
 
@@ -20,9 +20,9 @@ class Anchor
     private $parserState;
 
     /**
-     * @param int $position
+     * @param int<0, max> $position
      */
-    public function __construct($position, ParserState $parserState)
+    public function __construct(int $position, ParserState $parserState)
     {
         $this->position = $position;
         $this->parserState = $parserState;