- [Vent] The new decode event ABI before filter provides more keys but means vent must have access to all possible LogEvent ABIs when it is started. This is not practical in general so we now will will only err if an event matches but we have no ABI. This means we might not notice we have forgot to include an ABI since an event that would have matched on an ABI spec field (prefixed 'Event') will not just not match, and so fail silently.