Refactor how CachedCollector handles Closures

[tyler-sommer]

in src/Router/RouteCollector/CachedCollector.php, line 60

TODO comments are left in the code when a feature (or a bug) isn't completely developed (or fixed). You should complete the implementation and remove the comment.

    {
        $cache = new ConfigCache($this->cacheFile, $this->debug);
        if (!$cache->isFresh()) {
            $routes = $this->wrappedCollector->getData();

            // TODO: This seems a fragile way to handle this
            if (!$this->isCacheable($routes)) {
                return $routes;
            }

            $cache->write('<?php return '.var_export($routes, true).';');

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