interface DeviatesCastableAttributes (View source)
| mixed | increment(Model $model, string $key, mixed $value, array $attributes) Increment the attribute. | |
| mixed | decrement(Model $model, string $key, mixed $value, array $attributes) Decrement the attribute. | 
Increment the attribute.
Decrement the attribute.
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    https://laravel.com/api/8.x/Illuminate/Contracts/Database/Eloquent/DeviatesCastableAttributes.html