src/Feed/CalendarApiFeedType.php:135:29: InvalidArgument: Argument 2 of usort expects callable(mixed, mixed):int, but pure-Closure(mixed, mixed):bool provided (see https://psalm.dev/004)

src/Feed/CalendarApiFeedType.php:169:17: RiskyTruthyFalsyComparison: Operand of type false|mixed contains type mixed, which can be falsy and truthy. This can cause possibly unexpected behavior. Use strict comparison instead. (see https://psalm.dev/356)