  ///@param token The leveraged asset to swap PAR for
  function leverageSwap(bytes memory params, IERC20 token) internal {
    (uint256 parToSell, bytes memory dexTxData, uint dexIndex) = abi.decode(
      params,
      (uint256, bytes, uint )
    );
    token.approve(address(a.core()), 2**256 - 1);
    IERC20 par = IERC20(a.stablex());
    par.approve(address(a.core()), par.balanceOf(address(this)));
