Truffle – Compile Error with Trivial Assertion in Test

Before I did anything serious I just wanted to check the toolchain is working. I wrote a test like this:

pragma solidity ^0.4.2;

import "truffle/Assert.sol";
import "truffle/DeployedAddresses.sol";
import "../contracts/MyContract.sol";

contract TestMyContract {
  function testOneEqualsOne() {
    Assert.equal(1, 1, "The world as we know it has ended!");
  }
}

But it produces an error:

TestMyContract.sol:10:5: : Member "equal" not unique after argument-dependent lookup in type(library Assert)
    Assert.equal(1, 1, "The world as we know it has ended!");
    ^----------^

What's going on?

The sample test, which are created via truffle init all work perfectly:

uint expected = 10000;
Assert.equal(meta.getBalance(tx.origin), expected, "Owner should have 10000 MetaCoin initially");

And even with the arguments reversed:

Assert.equal(expected, meta.getBalance(tx.origin), "Owner should have 10000 MetaCoin initially");