fix(compiler): unbox runtime modulo results

phpunit/src/TypedScalarArithmeticCodegenTest.php

@@ -23,7 +23,7 @@ final class TypedScalarArithmeticCodegenTest extends \BaseTest
     {
         $code = $this->compileFixture();
 
-        self::assertStringContainsString('php::fn::mod(a, b)', $code);
+        self::assertStringContainsString('php::toInt(php::fn::mod(a, b))', $code);
         self::assertStringNotContainsString('((a) % (b))', $code);
     }
 

src/Parser/BinaryOpTrait.php

@@ -143,17 +143,21 @@ trait BinaryOpTrait
         }
 
         if ($op === '%') {
-            if (!($leftType === Type::INT and $rightType === Type::INT)) {
-                return 'php::fn::mod(' . $leftExpr . ', ' . $rightExpr . ')';
-            }
+            $requiresRuntimeModulo = $leftType !== Type::INT || $rightType !== Type::INT;
             // varint_types retains PHP's catchable modulo errors and
             // PHP_INT_MIN % -1 behavior. Native integers use raw C++ rules.
-            if ($this->varIntTypes
+            if (!$requiresRuntimeModulo
+                && $this->varIntTypes
                 && !$this->isExplicitNativeArithmeticExpr($left)
                 && !$this->isExplicitNativeArithmeticExpr($right)
                 && $this->evaluateConstantIntArithmetic($left, $right, '%') === null
             ) {
-                return 'php::fn::mod(' . $leftExpr . ', ' . $rightExpr . ')';
+                $requiresRuntimeModulo = true;
+            }
+            if ($requiresRuntimeModulo) {
+                return $this->convertIntExpr(
+                    'php::fn::mod(' . $leftExpr . ', ' . $rightExpr . ')',
+                );
             }
         }
 

tests/compiler/object_property/runtime-mod-int-property-assignment.phpt

@@ -0,0 +1,45 @@
+--TEST--
+Runtime modulo result can be assigned to an optimized int property
+--FILE--
+<?php
+
+namespace RuntimeModuloNamespace {
+
+final class Cursor
+{
+    private array $items = [];
+    private int $selected = 5;
+
+    public function refresh(callable $provider): void
+    {
+        $this->items = $provider();
+    }
+
+    public function move(): void
+    {
+        $count = count($this->items);
+        $this->selected = $this->selected % $count;
+    }
+
+    public function selected(): int
+    {
+        return $this->selected;
+    }
+}
+
+}
+
+namespace {
+
+function main(): void
+{
+    $cursor = new RuntimeModuloNamespace\Cursor();
+    $cursor->refresh(fn(): array => [1, 2]);
+    $cursor->move();
+    var_dump($cursor->selected());
+}
+
+}
+?>
+--EXPECT--
+int(1)