ReadonlyidOptional ReadonlyknownWhich of the state's fields the row actually KNOWS, where it distinguishes them from a floor it is merely displaying (the head-amp's phantom/pad/SENS). Absent where the row makes no such distinction — never a claim that nothing is known.
ReadonlypathOptional ReadonlyrevThe console revision as of when the row was produced — the stamp the root stream's events carry, so a consumer running a ConvergenceClient accounts for what it received exactly as a browser tab does. Absent only on a console wired without the instrument.
Readonlystate
A stream event: a row, plus the console revision as of the read.