BroadcastAudienceFilter
What a saved audience selects, and what a broadcast send target reaches. A tree: and, or and
not hold more of this same type, ANDed with the dimensions beside them. Dimensions on one node AND
together, values within a dimension OR. An empty dimension does not constrain the audience and cannot be
written — omit it instead.
BroadcastAudienceFilterFields
Specific channels, pinned by id. Nothing re-resolves these, so an audience holding only these is a saved channel list.
Unanchored channel-name substrings, matched case-insensitively and ORed with each other. Resolved at send time, so channels created or renamed after the audience was saved are picked up.
Saved audiences, resolved to channels at send time. Values OR, so naming two means either of them; naming both means two ANDed branches. Always empty on an audience's own filter: an audience cannot be defined in terms of another audience.
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