Why do we have a $keyType in Eloquent while we always have to use at least $cast and $primaryKey if we want to make a string-based primary key?

[ProteanCode]

As the title says.

[tobias-af]

My guess is that it does implicit things like these two:

public $incrementing = false;
protected $casts = [
    'id' => 'string',   // primary key
];