API filter on multiple properties

Something that strikes me as I delve into this further is that filter syntax is largely undocumented.  There are examples in the legacy docs, nothing really in Swagger.  I have figured it out mostly via trial and error and the occasional support ticket. It is clear you can use AND logic with comma-separated components, but is is not clear if you can reference the same LHS multiple times.  The is really no indication you can implement OR via filter short of glob expression matching.  The only documentation I can find on filters specifically relate to limitations added for embedded special characters in the v2 API.  Perhaps the API team could document the various common parameters in Swagger or elsewhere?