do not allow negative leading zeros

Author: frederikbosch

src/Number.php

@@ -248,7 +248,7 @@ private static function parseIntegerPart(string $number): string
                 throw new InvalidArgumentException('Leading zeros are not allowed');
             }
 
-            $nonZero = true;
+            $nonZero = $digit !== '-';
         }
 
         return $number;

tests/MoneyTest.php

@@ -436,6 +436,18 @@ public function itThrowsWithDecimal(): void
         new Money('5.1', new Currency(self::CURRENCY));
     }
 
+    /**
+     * @phpstan-param numeric-string $amount
+     *
+     * @test
+     * @dataProvider leadingZeroExamples
+     */
+    public function itThrowsWithLeadingZeros($amount): void
+    {
+        $this->expectException(InvalidArgumentException::class);
+        new Money($amount, new Currency(self::CURRENCY));
+    }
+
     /**
      * @test
      */
@@ -635,4 +647,19 @@ public static function roundToUnitExamples(): array
             [10, 2, 0, Money::ROUND_HALF_UP],
         ];
     }
+
+    /**
+     * @phpstan-return non-empty-list<array{
+     *     numeric-string
+     * }>
+     */
+    public static function leadingZeroExamples(): array
+    {
+        return [
+            ['01'],
+            ['001'],
+            ['-01'],
+            ['-001'],
+        ];
+    }
 }