fixup! Bound decoder work to prevent a pointer fan-out denial of service

Author: oschwald

tests/MaxMind/Db/Test/Reader/DecoderTest.php

@@ -450,16 +450,16 @@ public function testPointerFanOutIsBounded(): void
 
     public function testMapPointerFanOutIsBounded(): void
     {
-        // Each map has two scalar keys whose values point to the map below.
+        // Each map has two distinct UTF-8 keys whose values point to the map below.
         // This makes the decoder visit the shared target twice per layer while
         // keeping the fixture itself small.
         $depth = 100;
         $buf = "\xa0"; // leaf: uint16 with value 0
         $prev = 0;
         for ($i = 0; $i < $depth; ++$i) {
             $offset = \strlen($buf);
-            $buf .= "\xe2\xa0" . $this->encodePointer1($prev)
-                . "\xa0" . $this->encodePointer1($prev);
+            $buf .= "\xe2\x41a" . $this->encodePointer1($prev)
+                . "\x41b" . $this->encodePointer1($prev);
             $prev = $offset;
         }