3 - **Breaking change:** adopt the new `Durability` API proposed in [RFC #6]
4 - this replaces and generalizes the existing concepts of constants
5 - **Breaking change:** remove "volatile" queries
6 - instead, create a normal query which invokes the
7 `report_untracked_read` method on the salsa runtime
8 - introduce "slots", an optimization to salsa's internal workings
9 - document `#[salsa::requires]` attribute, which permits private dependencies
10 - Adopt `AtomicU64` for `runtimeId` (#182)
11 - use `ptr::eq` and `ptr::hash` for readability
12 - upgrade parking lot, rand dependencies
14 [RFC #6]: https://github.com/salsa-rs/salsa-rfcs/pull/6