`Finder::exclude()` behaviour changed upon transfer to `nette/utils`

[janedbal]

Version: 3.0.0

Bug Description

Exclude method behaviour changed when trailing / is used.

Steps To Reproduce

Assume following dir structure:

root/
 ├─ vendor/...
 ├─ inner/finder.php
 └─ composer.json

And contents of finder.php:

require_once __DIR__ . '/../vendor/autoload.php';

$files = \Nette\Utils\Finder::findFiles('*.php')
    ->from(__DIR__ . '/../')
    ->exclude('vendor/')
    ->getIterator();

foreach ($files as $file) {
    echo $file->getPathname() . PHP_EOL;
}

composer require nette/finder:^2
php inner/finder.php # no vendor files outputted

composer require nette/finder:^3
php inner/finder.php # vendor files present

Expected Behavior

Equal behaviour to previous version OR documented BC break in release notes.

Note: Seeing release notes in nette/finder ("Finder moved"), it feels like no BC break is expected, but seeing release notes in nette/utils ("Finder rewritten"), it feels like anything can change.

Possible Solution

Using ->exclude('vendor') works on both versions.