BalanceDelta is imported but never referenced in RebateFiHook.sol (the line import {BalanceDelta} from "v4-core/types/BalanceDelta.sol";). The import is unused and appears to be leftover.
Why it matters: Unused imports increase bytecode size marginally (when linked libraries are pulled in) and reduce readability/maintainability.
Impact:
bytecode size increase
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