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+## Title
+[NC-AH-01] Use `byte32(0)` instead of `byte23(0)`
+
+## Summary
+`merkleRoot` is defined as `bytes32` type but it is compared to `bytes23(0)`.
+
+This is a different issue from the one noted in [GAS-2](https://gist.github.com/Picodes/42f9144fd8cba738f3a7098411737760#GAS-2) though it could be resolved by reflecting the GAS-2 remarks, but may not do so for readability.
+
+## Lines
+```solidity
+File: src/Pair.sol
+
+25:  bytes32 public immutable merkleRoot;
+
+465:  if (merkleRoot == bytes23(0)) return;
+```