StreamSubjectsMode Enum
Which subjects a stream covers by default - the per-stream fixation of the transmitter's "default_subjects" advertisement (SSF 1.0 Section 7.1), taken at stream creation so a later change of the advertisement does not silently re-scope existing streams.
public enum StreamSubjectsModeFields
All 0
Every subject appropriate for the stream is on it until removed: the receiver's removals carve subjects out, and its additions bring carved-out subjects back (SSF 1.0 Section 7.1, "ALL").
None 1
No subject is on the stream until the receiver adds it (SSF 1.0 Section 7.1, "NONE").