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/// @notice Execute a swap with exact input
function swap(
    PoolKey calldata key,
    IPoolManager.SwapParams calldata params,
    bytes calldata hookData
) external returns (BalanceDelta delta) {
    // Validate pool exists
    delta = poolManager.swap(key, params, hookData);
 
    // Settle token balances
    _settle(key.currency0, delta.amount0());
    _take(key.currency1, delta.amount1());
}