Error when using withManipulations in combination with enumerations

[tkempf]

When adding media with medialibrary v11 using withManipulations, the BackedEnum BorderType gets transformed to its scalar string value before calling the manipulation itself.
This leads to the following type error:
Spatie\Image\Image::border(): Argument #2 ($type) must be of type Spatie\Image\Enums\BorderType, string given

The code used is as follows:
$this->addMedia($params->favicon->file) ->preservingOriginal() ->withManipulations([ 'bgrectangle' => [ 'background' => ['color'=>$favIconbgcolor], 'border' => ['width' => $bordersize,'type' => BorderType::Expand, 'color'=>$bordercolor] ] ]) ->toMediaCollection('favicon');

[freekmurze]

It's accept a PR that fixes this.

[tkempf]

Ok, the problem occurs on FileAdder.php line 331 during
$media->manipulations = $this->manipulations;the manipulation get cast to an array as requested in Models/Media.php on Line 74

    protected $casts = [
        'manipulations' => 'array',
        'custom_properties' => 'array',
        'generated_conversions' => 'array',
        'responsive_images' => 'array',
    ];

For my purpose i just need a border, so i made it work for me now by recreating the Enum in Conversions/Manipulations 53
I made a PR but this is just a fast and dirty fix and has to be reviewed toroughly by
someone who has a better knwoledge of media-libary or functionality of custom casts in laravel.