revalidateTag method
Drops every key under tag, and returns the keys dropped.
Implementation
Future<List<String>> revalidateTag(String tag) async => <String>[
for (final Object? key in (_map(await _send(
'POST', 'api/cache/tags/${_segment(tag)}/revalidate'))[
'dropped'] as List?) ??
const <Object?>[])
'$key',
];