Seal BigNumber

Author: BenMorel

src/BigNumber.php

@@ -11,7 +11,12 @@
 use Override;
 
 /**
- * Common interface for arbitrary-precision rational numbers.
+ * Base class for arbitrary-precision numbers.
+ *
+ * This class is sealed: it is part of the public API but should not be subclassed in userland.
+ * Protected methods may change in any version.
+ *
+ * @phpstan-sealed BigInteger|BigDecimal|BigRational
  */
 abstract readonly class BigNumber implements \JsonSerializable, \Stringable
 {
@@ -324,8 +329,6 @@ private static function add(BigNumber $a, BigNumber $b) : BigNumber
             return $b->plus($a);
         }
 
-        /** @var BigInteger $a */
-
         return $a->plus($b);
     }