The stored pages that depend on any of tags, or undefined when the index cannot answer.
Undefined is not an empty set: an unindexed tag may mean no page depends on it or that the site
served before the index existed. A missed scoped purge shows visibly wrong content, worse than
an extra fill, so undefined sends the caller to a wholesale purge.
The stored pages that depend on any of
tags, or undefined when the index cannot answer.Undefined is not an empty set: an unindexed tag may mean no page depends on it or that the site served before the index existed. A missed scoped purge shows visibly wrong content, worse than an extra fill, so undefined sends the caller to a wholesale purge.