diff --git a/src/Calculator/BcMathCalculator.php b/src/Calculator/BcMathCalculator.php
index 087b3c05..123af44c 100644
--- a/src/Calculator/BcMathCalculator.php
+++ b/src/Calculator/BcMathCalculator.php
@@ -226,6 +226,6 @@ public static function mod(string $amount, string $divisor): string
             throw InvalidArgumentException::moduloByZero();
         }
 
-        return bcmod($amount, $divisor) ?? '0';
+        return bcmod($amount, $divisor);
     }
 }
diff --git a/src/Currencies/CryptoCurrencies.php b/src/Currencies/CryptoCurrencies.php
index b1a400c8..bce86b9b 100644
--- a/src/Currencies/CryptoCurrencies.php
+++ b/src/Currencies/CryptoCurrencies.php
@@ -82,14 +82,12 @@ private function getCurrencies(): array
      *     minorUnit: positive-int|0
      * }>
      *
-     * @psalm-suppress MoreSpecificReturnType do not specify all keys and values
      */
     private function loadCurrencies(): array
     {
         $file = __DIR__ . '/../../resources/binance.php';
 
         if (is_file($file)) {
-            /** @psalm-suppress LessSpecificReturnStatement */
             return require $file;
         }
 
diff --git a/src/Currencies/ISOCurrencies.php b/src/Currencies/ISOCurrencies.php
index 415a14ca..177f09dd 100644
--- a/src/Currencies/ISOCurrencies.php
+++ b/src/Currencies/ISOCurrencies.php
@@ -102,14 +102,12 @@ private function getCurrencies(): array
      *     numericCode: positive-int
      * }>
      *
-     * @psalm-suppress MoreSpecificReturnType do not specify all keys and values
      */
     private function loadCurrencies(): array
     {
         $file = __DIR__ . '/../../resources/currency.php';
 
         if (is_file($file)) {
-            /** @psalm-suppress LessSpecificReturnStatement */
             return require $file;
         }
 
diff --git a/tests/NumberTest.php b/tests/NumberTest.php
index 20104f9d..08e5aa47 100644
--- a/tests/NumberTest.php
+++ b/tests/NumberTest.php
@@ -97,6 +97,8 @@ public function itCreatesANumberFromAFloatingPointValue(): void
      * }>
      *
      * @psalm-suppress InvalidOperand
+     * @psalm-suppress LessSpecificReturnStatement
+     * @psalm-suppress MoreSpecificReturnType
      *
      * the {@see PHP_INT_MAX} operations below cannot be inferred to numeric-string
      * the {@see PHP_INT_MAX} operations below cannot be inferred to numeric-string