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6c4221818e
`i256` and `u256` - operators now use the same overflow convention as primitives - implement `<<` and `-` (previously just `>>` and `+`) - implement `Ord` correctly (the previous `PartialOrd` was broken) - correct `i256::SIGNED` to `true` The `Int`-trait is extended with `trailing_zeros`, `carrying_add`, and `borrowing_sub`.