Currently we have draft/experimental/undocumented support for multi-value filtering (or values separated by pipes)

+ http://<host>/.rest/delivery/tours/v1?destination=xxx|yyy
-> destination = xxx OR destination = yyy

Syntax to be refined in a follow-up discussion/ticket, before we formally document it.

—But we also want to support additive multi-value filtering, even in current draft implementation.

+ http://<host>/.rest/delivery/tours/v1?destination=xxx&destination=yyy
-> destination = xxx AND destination = yyy