Unclear what filtering with empty arrays does #1312
Description
Link to problem area: https://spec.matrix.org/v1.4/client-server-api/#_matrixclientv3useruseridfilter_eventfilter
Issue
It is unclear what providing an empty array for e.g. types or not_types would do. Is that treated as not providing the field (empirically this is what happens)?
According to tulir the proper way to filter out all event types is: {"not_types": ["*"]}