Address psalm issues raised by the introduction of LEAST function

src/Processor/Expression/FunctionEvaluator.php

@@ -1673,7 +1673,7 @@ private static function sqlTimestampdiff(
      * @param array<string, mixed> $row
      * @param QueryResult $result
      *
-     * @return int
+     * @return mixed|null
      * @throws ProcessorException
      */
     private static function sqlLeast(
@@ -1696,29 +1696,32 @@ private static function sqlLeast(
         $evaluated_args = [];
 
         foreach ($args as $arg) {
+            /** @var string|int|float|null $evaluated_arg */
             $evaluated_arg = Evaluator::evaluate($conn, $scope, $arg, $row, $result);
             if (is_null($evaluated_arg)) {
                 return null;
             }
 
             if (is_float($evaluated_arg)) {
                 $is_any_float = true;
-                $precision = max($precision, strlen(substr(strrchr(strval($evaluated_arg), "."), 1)));
+                $precision = max($precision, strlen(substr(strrchr((string) $evaluated_arg, "."), 1)));
             }
 
             $is_any_string = $is_any_string || is_string($evaluated_arg);
             $evaluated_args[] = $evaluated_arg;
         }
 
         if ($is_any_string) {
-            $evaluated_str_args = array_map(fn($evaluated_arg) => strval($evaluated_arg), $evaluated_args);
-            return min(...$evaluated_str_args);
+            $evaluated_str_args = array_map(function($arg) {
+                return (string) $arg;
+            }, $evaluated_args);
+            return min($evaluated_str_args);
         }
 
         if ($is_any_float) {
-            return number_format(min(...$evaluated_args), $precision);
+            return number_format((float) min($evaluated_args), $precision);
         }
 
-        return min(...$evaluated_args);
+        return min($evaluated_args);
     }
 }

tests/EndToEndTest.php

@@ -1447,8 +1447,11 @@ public function testLeast($args, $expected_value): void
         $pdo = self::getPdo('mysql:host=localhost;dbname=testdb');
         $pdo->setAttribute(\PDO::ATTR_EMULATE_PREPARES, false);
 
-        $args_str = implode(', ', array_map(fn ($arg) => is_null($arg) ? 'null' : strval($arg), $args));
-        $query = $pdo->prepare(sprintf('SELECT LEAST(%s) as result', $args_str),);
+        $args_str = implode(', ', array_map(function ($arg) {
+            return is_null($arg) ? 'null' : (string) $arg;
+        }, $args));
+
+        $query = $pdo->prepare(sprintf('SELECT LEAST(%s) as result', $args_str));
         $query->execute();
 
         $result = $query->fetch(\PDO::FETCH_ASSOC);