"ignores" option doesn't work, but "ignore" does.

[papiro]

This seems so strange to me. I tried the ignores option, per https://github.com/xojs/xo#ignores, with absolutely no effect, as such (in package.json):

"xo": {
    "ignores": ["**/*.spec.js"],
...

But it had no effect whatsoever. It had me scratching my head for a good 45 minutes. Then I did some searching and found this issue: #65 which is actually using a ignore option! So I changed mine and it suddenly started working!... But then I saw this issue: #244 and the ignores option is being used and seems the issue was resolved...

I'm totally confused. But I'm keeping it as ignore for now, since it works, even though the docs and several examples have it as ignores. What should it be?