fix(optimizer): preserve strict builtin validation

phpunit/code/func-call-optimizer-typed-arguments.php

@@ -28,4 +28,8 @@ function optimizerTypedArgumentCalls(): void
     in_array('1', [1], optimizerDynamicBool());
     strlen(null);
     json_decode('null', null);
+    floor('1.5');
+    round('1.25');
+    floor(1.5);
+    round(1.25);
 }

phpunit/src/ClosureTest.php

@@ -13,9 +13,12 @@ class ClosureTest extends \BaseTest
         $translator = $compiler;
         $compiler->addFiles([$testFile]);
         $compiler->prepareFile($testFile);
-        $compiler->convertFile($testFile);
+        $generated = $compiler->convertFile($testFile);
+        $code = file_get_contents($generated);
 
-        $this->assertTrue(true);
+        self::assertIsString($code);
+        self::assertSame(3, substr_count($code, 'php::newClosureWithParameters('));
+        self::assertSame(3, substr_count($code, 'php::ClosureStrictTypes::Enabled'));
     }
 
     public function testClosureRebindingIsRejectedAtCompileTime(): void

phpunit/src/FuncCallOptimizerTest.php

@@ -20,7 +20,9 @@ final class FuncCallOptimizerTest extends BaseTest
         self::assertSame(1, substr_count($code, 'php::fn::in_array('));
         self::assertSame(1, substr_count($code, 'php::fn::hypot('));
         self::assertSame(1, substr_count($code, 'php::fn::json_decode('));
-        self::assertSame(3, substr_count($code, 'php::call('));
+        self::assertSame(1, substr_count($code, 'php::fn::floor('));
+        self::assertSame(1, substr_count($code, 'php::fn::round('));
+        self::assertSame(5, substr_count($code, 'php::call('));
         self::assertStringContainsString('php_optimizertypedbool()', $code);
         self::assertStringContainsString('php_optimizertypedint()', $code);
         self::assertStringContainsString('php_optimizertypedfloat()', $code);
@@ -31,5 +33,7 @@ final class FuncCallOptimizerTest extends BaseTest
         self::assertStringContainsString('php::fn::hypot(php::toFloat(', $code);
         self::assertStringContainsString('php::ArgList{php::null}', $code);
         self::assertMatchesRegularExpression('/php::fn::json_decode\([^;]+php::null\);/', $code);
+        self::assertStringContainsString('php::fn::floor(1.5)', $code);
+        self::assertStringContainsString('php::fn::round(1.25)', $code);
     }
 }

src/Generator/ClosureGenerator.php

@@ -49,7 +49,7 @@ trait ClosureGenerator
                 . $this->escapeBool(!$param->variadic && $param->default === null) . '}';
         }
         return 'php::newClosureWithParameters(' . $callback . ', ' . $uses . ', ' . $thisArg . ', ' . $scope
-            . ', { ' . implode(', ', $parameterDescriptors) . ' })';
+            . ', { ' . implode(', ', $parameterDescriptors) . ' }, php::ClosureStrictTypes::Enabled)';
     }
 
     protected function parseArrowFunction(Expr\ArrowFunction $expr): string

src/Optimizer/FuncCallOptimizer.php

@@ -127,31 +127,43 @@ trait FuncCallOptimizer
             'defined'            => ['constFold' => self::FOLD_KNOWN_CONSTANT],
 
             // Big* dispatch
-            'abs' => ['bigDispatch' => [
-                Type::BIGINT => 'php::BigInt::abs',
-                Type::BIGFLOAT => 'php::BigFloat::abs',
-                Type::DECIMAL => 'php::Decimal::abs',
-                'fallback' => 'php::fn::abs',
-            ]],
+            'abs' => [
+                'bigDispatch' => [
+                    Type::BIGINT => 'php::BigInt::abs',
+                    Type::BIGFLOAT => 'php::BigFloat::abs',
+                    Type::DECIMAL => 'php::Decimal::abs',
+                    'fallback' => 'php::fn::abs',
+                ],
+                'fallbackArgTypes' => [[Type::INT, Type::FLOAT]],
+            ],
             'pow' => ['bigDispatch' => [
                 Type::BIGINT => 'php::BigInt::pow',
                 Type::DECIMAL => 'php::Decimal::pow',
                 'fallback' => 'php::fn::pow',
             ]],
-            'sqrt' => ['bigDispatch' => [
-                Type::BIGINT => 'php::BigInt::sqrt',
-                Type::DECIMAL => 'php::Decimal::sqrt',
-                Type::BIGFLOAT => 'php::BigFloat::sqrt',
-                'fallback' => 'php::fn::sqrt',
-            ]],
-            'floor' => ['bigDispatch' => [
-                Type::DECIMAL => 'php::Decimal::floor',
-                'fallback' => 'php::fn::floor',
-            ]],
-            'ceil' => ['bigDispatch' => [
-                Type::DECIMAL => 'php::Decimal::ceil',
-                'fallback' => 'php::fn::ceil',
-            ]],
+            'sqrt' => [
+                'bigDispatch' => [
+                    Type::BIGINT => 'php::BigInt::sqrt',
+                    Type::DECIMAL => 'php::Decimal::sqrt',
+                    Type::BIGFLOAT => 'php::BigFloat::sqrt',
+                    'fallback' => 'php::fn::sqrt',
+                ],
+                'fallbackArgTypes' => [[Type::INT, Type::FLOAT]],
+            ],
+            'floor' => [
+                'bigDispatch' => [
+                    Type::DECIMAL => 'php::Decimal::floor',
+                    'fallback' => 'php::fn::floor',
+                ],
+                'fallbackArgTypes' => [[Type::INT, Type::FLOAT]],
+            ],
+            'ceil' => [
+                'bigDispatch' => [
+                    Type::DECIMAL => 'php::Decimal::ceil',
+                    'fallback' => 'php::fn::ceil',
+                ],
+                'fallbackArgTypes' => [[Type::INT, Type::FLOAT]],
+            ],
 
             // Type conversions
             'strval'   => ['conversion' => self::ARG_TYPE_STR],
@@ -259,7 +271,11 @@ trait FuncCallOptimizer
             return $this->{$config['handler']}($name, $expr, $config);
         }
         if (isset($config['bigDispatch'])) {
-            return $this->dispatchBigType($expr, $config['bigDispatch']);
+            return $this->dispatchBigType(
+                $expr,
+                $config['bigDispatch'],
+                $config['fallbackArgTypes'] ?? [],
+            );
         }
         if (isset($config['conversion'])) {
             return $this->dispatchConversion($expr, $config['conversion']);
@@ -664,10 +680,25 @@ trait FuncCallOptimizer
         };
     }
 
-    protected function dispatchBigType(Node\Expr\FuncCall $expr, array $dispatch): string|false
+    protected function dispatchBigType(
+        Node\Expr\FuncCall $expr,
+        array $dispatch,
+        array $fallbackArgTypes = [],
+    ): string|false
     {
         $type = $this->detectTypeOfExpr($expr->args[0]->value);
-        $target = $dispatch[$type] ?? $dispatch['fallback'] ?? null;
+        $target = $dispatch[$type] ?? null;
+        if ($target === null) {
+            foreach ($fallbackArgTypes as $index => $acceptedTypes) {
+                $arg = $expr->args[$index] ?? null;
+                if (!$arg instanceof Node\Arg
+                    || !in_array($this->detectTypeOfExpr($arg->value), $acceptedTypes, true)
+                ) {
+                    return false;
+                }
+            }
+            $target = $dispatch['fallback'] ?? null;
+        }
         if (!$target) {
             return false;
         }
@@ -982,6 +1013,20 @@ trait FuncCallOptimizer
             }
             return 'php::Decimal::round(' . $a0 . ')';
         }
+        // Reflection reports int|float as a union, which is represented by a
+        // raw Variant in the generic ABI metadata. The direct round() wrapper
+        // accepts that Variant and performs its own numeric conversion, so it
+        // is only strict-compatible when the source type is already proven.
+        if (!in_array($type, [Type::INT, Type::FLOAT], true)) {
+            return false;
+        }
+        // PHP 8.4+ also declares $mode as int|RoundingMode. The direct PHPX
+        // wrapper takes an integer; enum objects must remain on Zend dispatch.
+        if (count($e->args) >= 3
+            && $this->detectTypeOfExpr($e->args[2]->value) !== Type::INT
+        ) {
+            return false;
+        }
         if (!$this->hasOptimizerSafeReflectedArguments($n, $e, $c)) {
             return false;
         }

tests/compiler/closure/strict-builtin-fallback.phpt

@@ -0,0 +1,39 @@
+--TEST--
+Closure calls preserve strict builtin argument validation on dynamic fallback
+--FILE--
+<?php
+declare(strict_types=1);
+
+function mixedInt(): mixed
+{
+    return 1;
+}
+
+function main(): void
+{
+    $calls = [
+        'arrow' => static fn() => in_array('1', [1], mixedInt()),
+        'closure' => static function (): float {
+            return sin('1');
+        },
+        'round' => static fn() => round('1.25'),
+        'floor' => static function (): float {
+            return floor('1.5');
+        },
+    ];
+
+    foreach ($calls as $name => $call) {
+        try {
+            $call();
+            echo $name, "=missing TypeError\n";
+        } catch (TypeError $error) {
+            echo $name, "=TypeError\n";
+        }
+    }
+}
+?>
+--EXPECT--
+arrow=TypeError
+closure=TypeError
+round=TypeError
+floor=TypeError

tests/compiler/stdlib/round_type_error.phpt

@@ -6,5 +6,5 @@ try { round("hello"); } catch (TypeError $e) { echo $e->getMessage() . "\n"; }
 var_dump(round(3.7));
 ?>
 --EXPECT--
-round(): Argument #1 ($num) must be of type int|float
+round(): Argument #1 ($num) must be of type int|float, string given
 float(4)

tests/compiler/stdlib/strict-builtin-union-types.phpt

@@ -0,0 +1,57 @@
+--TEST--
+Optimized numeric builtins preserve strict union parameter validation
+--FILE--
+<?php
+declare(strict_types=1);
+
+function main(): void
+{
+    var_dump(abs(-3));
+    var_dump(sqrt(9));
+    var_dump(floor(1.75));
+    var_dump(ceil(1.25));
+    var_dump(round(1.25, 1));
+
+    try {
+        abs('3');
+        echo "abs=missing TypeError\n";
+    } catch (TypeError $error) {
+        echo "abs=TypeError\n";
+    }
+    try {
+        sqrt('9');
+        echo "sqrt=missing TypeError\n";
+    } catch (TypeError $error) {
+        echo "sqrt=TypeError\n";
+    }
+    try {
+        floor('1.75');
+        echo "floor=missing TypeError\n";
+    } catch (TypeError $error) {
+        echo "floor=TypeError\n";
+    }
+    try {
+        ceil('1.25');
+        echo "ceil=missing TypeError\n";
+    } catch (TypeError $error) {
+        echo "ceil=TypeError\n";
+    }
+    try {
+        round('1.25');
+        echo "round=missing TypeError\n";
+    } catch (TypeError $error) {
+        echo "round=TypeError\n";
+    }
+}
+?>
+--EXPECT--
+int(3)
+float(3)
+float(1)
+float(2)
+float(1.3)
+abs=TypeError
+sqrt=TypeError
+floor=TypeError
+ceil=TypeError
+round=TypeError