Inconsistent behavior of `filter_var()` with `FILTER_REQUIRE_ARRAY` and `default` option for non-array inputs

Description

The following code:

<?php

var_dump(filter_var("a", FILTER_VALIDATE_INT, ['flags' => FILTER_REQUIRE_ARRAY, 'options' => ['default' => 'Failed']]));
var_dump(filter_var([1], FILTER_VALIDATE_INT, ['flags' => FILTER_REQUIRE_ARRAY, 'options' => ['default' => 'Failed']]));
var_dump(filter_var(["a"], FILTER_VALIDATE_INT, ['flags' => FILTER_REQUIRE_ARRAY, 'options' => ['default' => 'Failed']]));
var_dump(filter_var("a", FILTER_VALIDATE_INT, ['options' => ['default' => 'Failed']]));

Resulted in this output:

bool(false)
array(1) {[0]=> int(1)}
array(1) {[0]=> string(6) "Failed"}
string(6) "Failed"

But I expected this output instead:

array(1) {[0]=> string(6) "Failed"} or string(6) "Failed"
array(1) {[0]=> int(1)}
array(1) {[0]=> string(6) "Failed"}
string(6) "Failed"

Since the documentation says:

default, value to return if the filter fails

I was expecting to get at least some form of Failed.

PHP Version

PHP 8.3

Operating System

Windows 11

Start by reproducing the four filter_var() examples from the issue on PHP 8.3 and compare the outputs with the documented default behavior. Trace the filter_var() implementation and its existing tests for FILTER_REQUIRE_ARRAY and the default option; done means the chosen behavior is consistent for scalar and array inputs and covered by regression tests.