Why does this code return true for mutation challenge

For some reason this code returns true for [“hello”, “hey”] but it passes every other test and I don’t understand why

  **Your code so far**

function mutation(arr) {
let pre = arr[0].toLowerCase().split("");
let post = arr[1].toLowerCase().split("");
if (pre.includes(...post)) {
  return true;
} else {
return false;

mutation(["hello", "hey"]);
  **Your browser information:**

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 Safari/537.36

Challenge: Mutations

Link to the challenge:

includes() does not work that way:

You can’t use multiple arguments like that.

thanks for the reply, I’ll try to figure something else out! Though I would still like to know why it passed every other test case except for the one I pointed out

Random chance. It just so happened that for many of the test cases the first character is the one that is the most important.

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