IDs of the teams this membership originates from (nested teams). In a company with nested teams, a direct membership includes the team itself; an inherited one, the sub-team(s) where the employee is a direct member. Only populated on reads that compute source attribution — reads filtered by a single team, or by a single employee with with_source_attribution enabled. Empty otherwise, including create, update and delete responses, and always empty for companies without nested teams. An empty array does not distinguish "computed and genuinely empty" from "not computed for this read" or "could not be computed", so only apply attribution-dependent logic to a read you explicitly shaped for it. A team-anchored read stops attributing above roughly a thousand members of the filtered team: past that the attribution is not computed at all and every row comes back empty, behind a normal 200.
