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3412a3ec54
## Issue Addressed Resolves #1100 ## Proposed Changes * Implement the `SafeArith` trait for `Slot` and `Epoch`, so that methods like `safe_add` become available. * Tweak the `SafeArith` trait to allow a different `Rhs` type (analagous to `std::ops::Add`, etc). * Add a `legacy-arith` feature to `types` and `state_processing` that conditionally enables implementations of the `std` ops with saturating semantics. * Check compilation of `types` and `state_processing` _without_ `legacy-arith` on CI, thus guaranteeing that they only use the `SafeArith` primitives 🎉 ## Additional Info The `legacy-arith` feature gets turned on by all higher-level crates that depend on `state_processing` or `types`, thus allowing the beacon chain, networking, and other components to continue to rely on the availability of ops like `+`, `-`, `*`, etc. **This is a consensus-breaking change**, but brings us in line with the spec, and our incompatibilities shouldn't have been reachable with any valid configuration of Eth2 parameters. |
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