build: fix latent phan findings under the newest analyzer (no API change)

Author: SmetDenis

src/fake-index.php

@@ -77,7 +77,7 @@
 
 $cliOptions->process(Env::string('PHPUNINT_ARGUMENTS'));
 
-$realIndex = (string)($realIndex ?? \realpath($cliOptions->getOption('index')));
+$realIndex = (string)($realIndex ?? \realpath((string)$cliOptions->getOption('index')));
 
 if (\class_exists(CovCatcher::class) && Sys::hasXdebug()) {
     $testname = (string)data($_REQUEST)->get('testname');

src/functions/aliases.php

@@ -78,12 +78,10 @@ function isFalse(mixed $value, string $message = ''): void
 }
 
 /**
- * @param string $expected
- * @param mixed  $className
+ * @param class-string $expected
+ * @param mixed        $className
  *
- * @psalm-template ExpectedType of object
- * @psalm-param    class-string<ExpectedType> $expected
- * @phan-suppress  PhanPluginCanUseParamType
+ * @phan-suppress PhanPluginCanUseParamType
  */
 function isClass($expected, $className, string $message = ''): void
 {