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Kirill Smelkov authored
and to deliver to watchq only and all events in (at₀, +∞] range. This continues 4d2c8b1d (go/zodb: Require drivers to provide notifications for database change events) and makes initialization semantics to process invalidations easier for both application-level ZODB layer, and for low-level users that work with drivers directly: - there is no possibility that an event will come from watchq with tid < current user head. - there is no possibility that watcher will start delivering events after at₀, but not immediately after it, i.e. users can rely that they won't loose an event. This correctness invariants should be easy to provide in drivers.
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