Reorganize exceptions structure

src/Context/CustomContext.php

@@ -10,11 +10,9 @@
 use Brick\Math\RoundingMode;
 use Brick\Money\Context;
 use Brick\Money\Currency;
-use Brick\Money\Exception\MoneyException;
+use Brick\Money\Exception\InvalidArgumentException;
 use Override;
 
-use function sprintf;
-
 /**
  * Adjusts a number to a custom scale and optionally step.
  */
@@ -32,11 +30,11 @@ public function __construct(
     ) {
         /** @psalm-suppress DocblockTypeContradiction, NoValue */
         if ($scale < 0) {
-            throw new MoneyException(sprintf('Invalid scale: %d.', $scale));
+            throw InvalidArgumentException::invalidScale($scale);
         }
 
         if ($step < 1 || ! $this->isValidStepForScale($scale, $step)) {
-            throw new MoneyException(sprintf('Invalid step: %d.', $step));
+            throw InvalidArgumentException::invalidStep($step);
         }
     }
 

src/Exception/CurrencyConversionException.php

@@ -4,14 +4,15 @@
 
 namespace Brick\Money\Exception;
 
+use RuntimeException;
 use Throwable;
 
 use function sprintf;
 
 /**
  * Exception thrown when an exchange rate is not available.
  */
-final class CurrencyConversionException extends MoneyException
+final class CurrencyConversionException extends RuntimeException implements MoneyException
 {
     public function __construct(
         string $message,

src/Exception/InvalidArgumentException.php

@@ -0,0 +1,23 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Brick\Money\Exception;
+
+use function sprintf;
+
+/**
+ * Exception thrown when an invalid argument is provided.
+ */
+final class InvalidArgumentException extends \InvalidArgumentException implements MoneyException
+{
+    public static function invalidScale(int $scale): self
+    {
+        return new self(sprintf('Invalid scale: %d.', $scale));
+    }
+
+    public static function invalidStep(int $step): self
+    {
+        return new self(sprintf('Invalid step: %d.', $step));
+    }
+}

src/Exception/MoneyException.php

@@ -4,11 +4,11 @@
 
 namespace Brick\Money\Exception;
 
-use RuntimeException;
+use Throwable;
 
 /**
- * Base class for money exceptions.
+ * Interface for money exceptions.
  */
-class MoneyException extends RuntimeException
+interface MoneyException extends Throwable
 {
 }

src/Exception/MoneyMismatchException.php

@@ -5,13 +5,14 @@
 namespace Brick\Money\Exception;
 
 use Brick\Money\Currency;
+use RuntimeException;
 
 use function sprintf;
 
 /**
  * Exception thrown when a money is not in the expected currency or context.
  */
-final class MoneyMismatchException extends MoneyException
+final class MoneyMismatchException extends RuntimeException implements MoneyException
 {
     public static function currencyMismatch(Currency $expected, Currency $actual): self
     {

src/Exception/UnknownCurrencyException.php

@@ -4,12 +4,14 @@
 
 namespace Brick\Money\Exception;
 
+use RuntimeException;
+
 use function implode;
 
 /**
  * Exception thrown when attempting to create a Currency from an unknown currency code.
  */
-final class UnknownCurrencyException extends MoneyException
+final class UnknownCurrencyException extends RuntimeException implements MoneyException
 {
     public static function unknownCurrency(string|int $currencyCode): self
     {