Fix BcMath\Number increment/decrement

Author: mpesari

src/Rules/Operators/InvalidIncDecOperationRule.php

@@ -113,7 +113,7 @@ public function processNode(Node $node, Scope $scope): array
 			$deprecatedString = true;
 		}
 
-		$allowedTypes = [new FloatType(), new IntegerType(), $string, new ObjectType('SimpleXMLElement')];
+		$allowedTypes = [new FloatType(), new IntegerType(), $string, new ObjectType('SimpleXMLElement'), new ObjectType('BcMath\Number')];
 		$deprecatedNull = false;
 		if (
 			!$this->phpVersion->deprecatesDecOnNonNumericString()

tests/PHPStan/Rules/Operators/InvalidIncDecOperationRuleTest.php

@@ -237,24 +237,7 @@ public function testIncNonNumericString(): void
 	#[RequiresPhp('>= 8.4')]
 	public function testBcMathNumber(): void
 	{
-		$this->analyse([__DIR__ . '/data/inc-dec-bcmath-number.php'], [
-			[
-				'Cannot use ++ on BcMath\Number.',
-				9,
-			],
-			[
-				'Cannot use ++ on BcMath\Number.',
-				10,
-			],
-			[
-				'Cannot use -- on BcMath\Number.',
-				11,
-			],
-			[
-				'Cannot use -- on BcMath\Number.',
-				12,
-			],
-		]);
+		$this->analyse([__DIR__ . '/data/inc-dec-bcmath-number.php'], []);
 	}
 
 }