Code change:
Challenge has an issue. User Agent is: <codeMozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.99 Safari/537.36</code. Please describe how to reproduce this issue, and include links to screenshots if possible. My code:
Closing. Please feel free to re-open with steps and a description on how to reproduce the issue. Happy Coding!

Related discussion:
text: "description": [ "Compare and update inventory stored in a 2d array against a second 2d array of a fresh delivery. Update current inventory item quantity, and if an item cannot be found, add the new item and quantity into the inventory array in alphabetical order." ], <del> "challengeSeed": "function inventory(arr1, arr2) {n    // All inventory must be accounted for or you're fired!rn    return arr1;rn}nn// Example inventory listsrnvar curInv = [rn    [21, 'Bowling Ball'],rn    [2, 'Dirty Sock'],rn    [1, 'Hair pin'],rn    [5, 'Microphone']rn];rnrnvar newInv = [rn    [2, 'Hair Pin'],rn    [3, 'Half-Eaten Apple'],rn    [67, 'Bowling Ball'],rn    [7, 'Toothpaste']rn];rnrninventory(curInv, newInv);", "tests": [ "expect(inventory([[21, 'Bowling Ball'], [2, 'Dirty Sock'], [1, 'Hair pin'], [5, 'Microphone']], [[2, 'Hair Pin'], [3, 'Half-Eaten Apple'], [67, 'Bowling Ball'], [7, 'Toothpaste']])).to.be.a('array');", "assert.equal(inventory([[21, 'Bowling Ball'], [2, 'Dirty Sock'], [1, 'Hair pin'], [5, 'Microphone']], [[2, 'Hair Pin'], [3, 'Half-Eaten Apple'], [67, 'Bowling Ball'], [7, 'Toothpaste']]).length, 6);", "assert.deepEqual(inventory([[21, 'Bowling Ball'], [2, 'Dirty Sock'], [1, 'Hair pin'], [5, 'Microphone']], [[2, 'Hair Pin'], [3, 'Half-Eaten Apple'], [67, 'Bowling Ball'], [7, 'Toothpaste']]), [[88, 'Bowling Ball'], [2, 'Dirty Sock'], [3, 'Hair pin'], [3, 'Half-Eaten Apple'], [5, 'Microphone'], [7, 'Toothpaste']]);", "assert.deepEqual(inventory([[21, 'Bowling Ball'], [2, 'Dirty Sock'], [1, 'Hair pin'], [5, 'Microphone']], []), [[21, 'Bowling Ball'], [2, 'Dirty Sock'], [1, 'Hair pin'], [5, 'Microphone']]);", "assert.deepEqual(inventory([], [[2, 'Hair Pin'], [3, 'Half-Eaten Apple'], [67, 'Bowling Ball'], [7, 'Toothpaste']]), [[2, 'Hair Pin'], [3, 'Half-Eaten Apple'], [67, 'Bowling Ball'], [7, 'Toothpaste']]);", "assert.deepEqual(inventory([[0, 'Bowling Ball'], [0, 'Dirty Sock'], [0, 'Hair pin'], [0, 'Microphone']], [[1, 'Hair Pin'], [1, 'Half-Eaten Apple'], [1, 'Bowling Ball'], [1, 'Toothpaste']]), [[1, 'Bowling Ball'], [1, 'Dirty Sock'], [1, 'Hair pin'], [1, 'Half-Eaten Apple'], [1, 'Microphone'], [1, 'Toothpaste']]);" </del> <ins> "challengeSeed": "function inventory(arr1, arr2) {n    // All inventory must be accounted for or you're fired!rn    return arr1;rn}nn// Example inventory listsrnvar curInv = [rn    [21, 'Bowling Ball'],rn    [2, 'Dirty Sock'],rn    [1, 'Hair Pin'],rn    [5, 'Microphone']rn];rnrnvar newInv = [rn    [2, 'Hair Pin'],rn    [3, 'Half-Eaten Apple'],rn    [67, 'Bowling Ball'],rn    [7, 'Toothpaste']rn];rnrninventory(curInv, newInv);", "tests": [ "expect(inventory([[21, 'Bowling Ball'], [2, 'Dirty Sock'], [1, 'Hair Pin'], [5, 'Microphone']], [[2, 'Hair Pin'], [3, 'Half-Eaten Apple'], [67, 'Bowling Ball'], [7, 'Toothpaste']])).to.be.a('array');", "assert.equal(inventory([[21, 'Bowling Ball'], [2, 'Dirty Sock'], [1, 'Hair Pin'], [5, 'Microphone']], [[2, 'Hair Pin'], [3, 'Half-Eaten Apple'], [67, 'Bowling Ball'], [7, 'Toothpaste']]).length, 6);", "assert.deepEqual(inventory([[21, 'Bowling Ball'], [2, 'Dirty Sock'], [1, 'Hair Pin'], [5, 'Microphone']], [[2, 'Hair Pin'], [3, 'Half-Eaten Apple'], [67, 'Bowling Ball'], [7, 'Toothpaste']]), [[88, 'Bowling Ball'], [2, 'Dirty Sock'], [3, 'Hair Pin'], [3, 'Half-Eaten Apple'], [5, 'Microphone'], [7, 'Toothpaste']]);", "assert.deepEqual(inventory([[21, 'Bowling Ball'], [2, 'Dirty Sock'], [1, 'Hair Pin'], [5, 'Microphone']], []), [[21, 'Bowling Ball'], [2, 'Dirty Sock'], [1, 'Hair Pin'], [5, 'Microphone']]);", "assert.deepEqual(inventory([], [[2, 'Hair Pin'], [3, 'Half-Eaten Apple'], [67, 'Bowling Ball'], [7, 'Toothpaste']]), [[67, 'Bowling Ball'], [2, 'Hair Pin'], [3, 'Half-Eaten Apple'], [7, 'Toothpaste']]);", "assert.deepEqual(inventory([[0, 'Bowling Ball'], [0, 'Dirty Sock'], [0, 'Hair Pin'], [0, 'Microphone']], [[1, 'Hair Pin'], [1, 'Half-Eaten Apple'], [1, 'Bowling Ball'], [1, 'Toothpaste']]), [[1, 'Bowling Ball'], [0, 'Dirty Sock'], [1, 'Hair Pin'], [1, 'Half-Eaten Apple'], [0, 'Microphone'], [1, 'Toothpaste']]);" </ins> ] } ]