Function selector of function that takes enum as argument

Question

If a function takes an enum as a parameter

function foo(MyEnum arg1, uint256 arg2) public returns (bool);

how do I properly compute the function selector for that function?

Answer 1

If you compile a contract with that function in it and take a look at the generated ABI, you'll see that the enum parameter ends up being a uint8. So compute the selector like this:

web3.sha3('foo(uint8,uint256)').substring(0,10) === '0xfec108d0'