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Update SimpleTokenSwap.sol #6
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Fixed typos, worth also noting that `require(sellToken.approve(spender, uint256(-1)));` cant be used from >0.8.0. Users must should declare a max constant as a member variable and pass that instead something like:
```
// as a member on the contract
uint256 public constant MASK = type(uint128).max;
....
require(sellToken.approve(spender, MASK), "approve failed");
```
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Fixed typos, worth also noting that
require(sellToken.approve(spender, uint256(-1)));cant be used from >0.8.0. Users should declare a max constant as a member variable and pass that instead something like: