Improve static analysis

phpstan-baseline.neon

@@ -1,16 +0,0 @@
-parameters:
-	ignoreErrors:
-		-
-			message: "#^Generator expects key type int\\|string, mixed given\\.$#"
-			count: 1
-			path: src/Parser.php
-
-		-
-			message: "#^Parameter \\#1 \\$json of method Cerbero\\\\JsonParser\\\\Decoders\\\\ConfigurableDecoder\\:\\:decode\\(\\) expects string, int\\|string given\\.$#"
-			count: 1
-			path: src/Parser.php
-
-		-
-			message: "#^Binary operation \"\\+\" between int\\|string and 1 results in an error\\.$#"
-			count: 1
-			path: src/Tree.php

src/Decoders/ConfigurableDecoder.php

@@ -20,14 +20,14 @@ final class ConfigurableDecoder
     }
 
     /**
-     * Decode the given JSON.
+     * Decode the given value.
      *
-     * @param string $json
+     * @param string|int $value
      * @return mixed
      */
-    public function decode(string $json): mixed
+    public function decode(string|int $value): mixed
     {
-        $decoded = $this->config->decoder->decode($json);
+        $decoded = $this->config->decoder->decode((string) $value);
 
         if (!$decoded->succeeded) {
             call_user_func($this->config->onError, $decoded);

src/Parser.php

@@ -68,6 +68,7 @@ final class Parser implements IteratorAggregate
             }
 
             if ($this->state->hasBuffer()) {
+                /** @var string|int $key */
                 $key = $this->decoder->decode($this->state->key());
                 $value = $this->decoder->decode($this->state->value());
 

src/Tree.php

@@ -115,7 +115,9 @@ final class Tree
     public function traverseArray(array $referenceTokens): void
     {
         $referenceToken = $referenceTokens[$this->depth] ?? null;
-        $this->original[$this->depth] = isset($this->original[$this->depth]) ? $this->original[$this->depth] + 1 : 0;
+        $index = $this->original[$this->depth] ?? null;
+
+        $this->original[$this->depth] = is_int($index) ? $index + 1 : 0;
         $this->wildcarded[$this->depth] = $referenceToken == '-' ? '-' : $this->original[$this->depth];
 
         $this->trim();