BelongsTo FormData type changes when editing the resource

[SteffenAuer]

• Laravel Version: 8.83.15
• Nova Version: 4.7.0
• PHP Version: 8.0.19
• Database Driver & Version: MySQL 8.0.29
• Operating System and Version: Linux 5.10.104-linuxkit aarch64
• Browser type and version: Firefox 101 & Safari 15.5
• Reproduction Repository: (Private)

Description:

• When used in dependent fields, the type of the value of a BelongsTo field differs between initial page load and when it is changed
  • On inital load, it is an integer
  • When the dependable field value is changed, it becomes a string

Detailed steps to reproduce the issue on a fresh Nova installation:

BelongsTo::make('Type')
    ->rules('required')
    ->withoutTrashed()
    ->filterable(),

Text::make('Offering')
    ->dependsOn('type', function (Text $field, NovaRequest $request, FormData $formData) {
        logger(gettype($formData->type)); // <<< HERE

        $type = $formData->type;

        // Note: $requiredType is a string value representing the id of a specific Type
        $type === $requiredType ? // <<< This check fails because the type differs
            $field->required() :
            $field->hide();
    })
    ->hideFromIndex(),

1. Create a resource with these fields
2. Open the edit page for that same resource
3. Change the value of the Type BelongsTo
4. In the logs, you'll see integer logged first and string logged second

   [2022-06-08 01:06:44] local.DEBUG: integer
   [2022-06-08 01:06:48] local.DEBUG: string

[crynobone]

This can be caused by Eloquent casting the value to integer while normal XHR coming from <select> sending string. You should cover for both scenarios.