@hyperlane-xyz/core
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Core solidity contracts for Hyperlane
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# `L2OutputOracle` Invariants
## The block number of the output root proposals should monotonically increase.
**Test:** [`L2OutputOracle.t.sol#L59`](../contracts/test/invariants/L2OutputOracle.t.sol#L59)
When a new output is submitted, it should never be allowed to correspond to a block number that is less than the current output.