Refactor: use single TypeCombinator::intersect call for performance

Instead of incrementally intersecting types in a loop, collect all inner
value types and pass them to a single TypeCombinator::intersect() call.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: phpstan-bot

src/Type/Php/InArrayFunctionTypeSpecifyingExtension.php

@@ -121,17 +121,12 @@ public function specifyTypes(FunctionReflection $functionReflection, FuncCall $n
 			// array{A}|array{B}, getIterableValueType() returns A|B but neither
 			// value is guaranteed to be in every variant.
 			$innerTypes = $arrayType instanceof UnionType ? $arrayType->getTypes() : [$arrayType];
-			$guaranteedValueType = null;
+			$innerValueTypes = [];
 			foreach ($innerTypes as $innerType) {
-				$innerValueType = $innerType->getIterableValueType();
-				if ($guaranteedValueType === null) {
-					$guaranteedValueType = $innerValueType;
-				} else {
-					$guaranteedValueType = TypeCombinator::intersect($guaranteedValueType, $innerValueType);
-				}
+				$innerValueTypes[] = $innerType->getIterableValueType();
 			}
-			if ($guaranteedValueType !== null) {
-				$narrowingValueType = $guaranteedValueType;
+			if (count($innerValueTypes) > 0) {
+				$narrowingValueType = TypeCombinator::intersect(...$innerValueTypes);
 			}
 		}
 		if (