Config cache fails with "Your configuration files are not serializable" due to "ip_selector"

[dev-ramchander]

When using the ipinfo configuration in Laravel 10 with a custom IP selector object, the php artisan config:cache command fails, throwing the error:

LogicException

Your configuration files are not serializable.

at vendor\laravel\framework\src\Illuminate\Foundation\Console\ConfigCacheCommand.php:73

The root cause is the direct instantiation of CustomIPSelector in the configuration array, as shown

'ipinfo' => [
    'access_token' => env('IPINFO_SECRET'),
    'ip_selector' => new CustomIPSelector(),
    'filter' => false,
    'no_except' => true,
],

Steps to Reproduce:

1. Define the configuration as above.
2. Run php artisan config:cache.
3. Observe the error:

LogicException
Your configuration files are not serializable.

Workaround Attempt:
Replacing the instantiation with the class name works for php artisan config:cache:

'ipinfo' => [
    'access_token' => env('IPINFO_SECRET'),
    'ip_selector' => App\Helpers\CustomIPSelector::class,
    'filter' => false,
    'no_except' => true,
],

However, this leads to another error when using the ipinfo library:

Call to a member function getIP() on string

This happens because the library directly uses the ip_selector configuration value without instantiating the class.