Function check_member_content_size 

pub(crate) async fn check_member_content_size(
    services: &Services,
    sender: &UserId,
    room_id: &RoomId,
    state_key: &str,
    json: &Raw<AnyStateEventContent>,
) -> Result

Refuses a client’s member event that is over the configured budget, or that newly stores a display name or avatar URL past its limit.

A stored name or avatar the write leaves unchanged is not bounded again, as long as the whole content fits the byte cap. A missing or unreadable stored event checks every value, as a first write does.