fix: negative numbers had the wrong type

Author: taka-oyama

composer.json

@@ -31,7 +31,8 @@
     "ext-mbstring": "*"
   },
   "require-dev": {
-    "ext-json": "*"
+    "ext-json": "*",
+    "phpunit/phpunit": "~9.6"
   },
   "autoload": {
     "psr-4": {

src/ParserHelper.php

@@ -47,7 +47,7 @@ public static function convertCodepointToCharacter(int $char): string
     public static function convertToNumber(string $text)
     {
         // thanks to #andig for the fix for big integers
-        if (ctype_digit($text) && (float) $text === (float) ((int) $text)) {
+        if (filter_var($text, FILTER_VALIDATE_INT) && (float) $text === (float) ((int) $text)) {
             // natural number PHP_INT_MIN < $num < PHP_INT_MAX
             return (int) $text;
         }

tests/RegexListenerTest.php

@@ -352,10 +352,13 @@ public function testBasicArrayReadCapture(): void
             ->getMock()
         ;
 
-        $valueCall->expects($this->exactly(2))
+        $valueCall->expects($this->exactly(3))
             ->method('__invoke')
-            ->withConsecutive(['1', '/0'],
-                ['2', '/1'])
+            ->withConsecutive(
+                ['1', '/0'],
+                ['2', '/1'],
+                ['-1', '/2']
+            )
         ;
 
         $listener = new RegexListener(["(/\d*)" => $valueCall]);

tests/data/simpleArray.json

@@ -1 +1 @@
-[1,2]
+[1,2,-1]