Error searching for fields type Checkbox

I can't search for a field of type checkbox by passing `false`; this throws an "Invalid value" error.

On endpoint: POST /api/v2/custom_objects/{custom_object_key}/records/search

Example Request:

{

    "filter":{ 

        "$and": [

            {"custom_object_fields.avaliable": {"$eq": false}}

        ]

    }

}

Response:

{

    "error": {

        "title": "Unsupported Condition",

        "message": “Invalid value”

    }

}