You're right, we only use the params we need for the current filter type. I think if we're hiding a form field and not using its param, then we shouldn't be sending the data at all, just feels more correct to me. I'll leave it to you to decide, though. Use your best judgement.

(The way we're parsing params, if the day isn't present, we'll just end up using the current day, so there shouldn't be any issues with null values.)