Under the hood
Documentation for per-model weekly usage data now spells out what 'missing' means versus 'empty'
What
The internal documentation comment for the per-model weekly usage-window data was rewritten to clarify a distinction: if the field is absent entirely, nothing is known about it (for example because the data came from a cache or the account was hidden by an allowlist), whereas an empty array means the server answered and confirmed there are no usage windows for the account.
Why
This is a documentation clarification for a data field rather than a behavior change; it helps whoever reads this usage data avoid confusing 'we don't know' with 'we know there's nothing'.