Diff Two Arrays: why must result array be in same order?[SOLVED]

Diff Two Arrays: why must result array be in same order?[SOLVED]
0.0 0

#1

Never mind. The order doesn’t matter, despite what the test suit looks like. Sheesh.

Why in Diff Two Arrays is

["diorite", "pink wool"]

considered different than

 ["pink wool", "diorite"]

In other words, why does the order of the differing items matter?