Test accepting numeric strings

Author: ondrejmirtes

tests/PHPStan/Levels/data/acceptTypes-5.json

@@ -198,5 +198,15 @@
         "message": "Parameter #1 $min (340) of function random_int expects lower number than parameter #2 $max (int<min, 339>).",
         "line": 685,
         "ignorable": true
+    },
+    {
+        "message": "Parameter #1 $numericString of method Levels\\AcceptTypes\\NumericStrings::doBar() expects string&numeric, 'foo' given.",
+        "line": 707,
+        "ignorable": true
+    },
+    {
+        "message": "Parameter #1 $numericString of method Levels\\AcceptTypes\\NumericStrings::doBar() expects string&numeric, string given.",
+        "line": 708,
+        "ignorable": true
     }
 ]

tests/PHPStan/Levels/data/acceptTypes.php

@@ -693,3 +693,27 @@ public function doStuff(): void
 	}
 
 }
+
+class NumericStrings
+{
+
+	/**
+	 * @param string $string
+	 * @param numeric-string $numericString
+	 */
+	public function doFoo(string $string, string $numericString): void
+	{
+		$this->doBar('1');
+		$this->doBar('foo');
+		$this->doBar($string);
+		$this->doBar($numericString);
+	}
+
+	/**
+	 * @param numeric-string $numericString
+	 */
+	public function doBar(string $numericString): void
+	{
+
+	}
+}