diff --git a/src/Year.php b/src/Year.php
index 143ccc9..6eaf5c9 100644
--- a/src/Year.php
+++ b/src/Year.php
@@ -13,9 +13,7 @@
 
 use function is_int;
 use function str_pad;
-use function trigger_error;
 
-use const E_USER_DEPRECATED;
 use const STR_PAD_LEFT;
 
 /**
@@ -243,16 +241,10 @@ public function atDay(int $dayOfYear): LocalDate
     public function atMonth(int|Month $month): YearMonth
     {
         if (is_int($month)) {
-            // usually we don't use trigger_error() for deprecations, but we can't rely on @deprecated for a parameter type change;
-            // maybe we should revisit using trigger_error() unconditionally for deprecations in the future.
-            trigger_error('Passing an integer to Year::atMonth() is deprecated, pass a Month instance instead.', E_USER_DEPRECATED);
-
             Field\MonthOfYear::check($month);
-
-            $month = Month::from($month);
         }
 
-        return YearMonth::of($this->year, $month->value);
+        return YearMonth::of($this->year, $month);
     }
 
     /**
diff --git a/src/YearMonth.php b/src/YearMonth.php
index 1cbd2b2..989b78a 100644
--- a/src/YearMonth.php
+++ b/src/YearMonth.php
@@ -14,9 +14,7 @@
 
 use function is_int;
 use function str_pad;
-use function trigger_error;
 
-use const E_USER_DEPRECATED;
 use const STR_PAD_LEFT;
 
 /**
@@ -46,16 +44,12 @@ public static function of(int $year, int|Month $month): YearMonth
         Field\Year::check($year);
 
         if (is_int($month)) {
-            // usually we don't use trigger_error() for deprecations, but we can't rely on @deprecated for a parameter type change;
-            // maybe we should revisit using trigger_error() unconditionally for deprecations in the future.
-            trigger_error('Passing an integer to YearMonth::of() second argument is deprecated, pass a Month instance instead.', E_USER_DEPRECATED);
-
             Field\MonthOfYear::check($month);
-
-            return new YearMonth($year, $month);
+        } else {
+            $month = $month->value;
         }
 
-        return new YearMonth($year, $month->value);
+        return new YearMonth($year, $month);
     }
 
     /**
@@ -216,10 +210,6 @@ public function withYear(int $year): YearMonth
     public function withMonth(int|Month $month): YearMonth
     {
         if (is_int($month)) {
-            // usually we don't use trigger_error() for deprecations, but we can't rely on @deprecated for a parameter type change;
-            // maybe we should revisit using trigger_error() unconditionally for deprecations in the future.
-            trigger_error('Passing an integer to YearMonth::withMonth() is deprecated, pass a Month instance instead.', E_USER_DEPRECATED);
-
             Field\MonthOfYear::check($month);
         } else {
             $month = $month->value;
diff --git a/src/YearWeek.php b/src/YearWeek.php
index 2828606..2be17fc 100644
--- a/src/YearWeek.php
+++ b/src/YearWeek.php
@@ -13,9 +13,7 @@
 
 use function is_int;
 use function str_pad;
-use function trigger_error;
 
-use const E_USER_DEPRECATED;
 use const STR_PAD_LEFT;
 
 /**
@@ -197,17 +195,13 @@ public function withWeek(int $week): YearWeek
     public function atDay(DayOfWeek|int $dayOfWeek): LocalDate
     {
         if (is_int($dayOfWeek)) {
-            // usually we don't use trigger_error() for deprecations, but we can't rely on @deprecated for a parameter type change;
-            // maybe we should revisit using trigger_error() unconditionally for deprecations in the future.
-            trigger_error('Passing an integer to YearWeek::atDay() is deprecated, pass a DayOfWeek instance instead.', E_USER_DEPRECATED);
-
             Field\DayOfWeek::check($dayOfWeek);
-
-            $dayOfWeek = DayOfWeek::from($dayOfWeek);
+        } else {
+            $dayOfWeek = $dayOfWeek->value;
         }
 
         $correction = LocalDate::of($this->year, 1, 4)->getDayOfWeek()->value + 3;
-        $dayOfYear = $this->week * 7 + $dayOfWeek->value - $correction;
+        $dayOfYear = $this->week * 7 + $dayOfWeek - $correction;
         $maxDaysOfYear = Field\Year::isLeap($this->year) ? 366 : 365;
 
         if ($dayOfYear > $maxDaysOfYear) {