Adding Items to an Array with push() and unshift()

Tell us what’s happening:
I am not sure what I am doing wrong, this will not pass.
After several failures, I looked at the code for the “Hint”.
What is said to be the solution is one of the code attempts I wrote on the exercise.
I have tried single quotes, double quotes, white space after the commas, no white space after the commas… all to no avail. I pasted the code into Scrimba and it ran correctly there.
Assistance would be appreciated so I can move on.

Your code so far

function mixedNumbers(arr) {
  // change code below this line
arr.unshift('I', 2, 'three');
arr.push(7, 'VII', 9);
  // change code above this line
  return arr;

// do not change code below this line
console.log(mixedNumbers(['IV', 5, 'six']));

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:65.0) Gecko/20100101 Firefox/65.0.

Link to the challenge:

Check your Roman numeral for 8. You’re missing an I.

oh Duh
How I left it out 13 times is beyond me.
Thank you @kevcomedia.