[08:37:21] <Krinkle>	 Turns out if you mix up `arr` and `str` in the call `arr.includes(str)`, e.g. with arr=['foo'] and str='foo', it works just as well.
[08:38:05] <Krinkle>	 because `str.includes(arr)` -> `str.includes(arr.toString())` -> arr.join(',') -> ['foo'].join(',') == 'foo' -> 'foo'.includes('foo') -> true
[08:38:19] <Krinkle>	 only works for 1 item, though :D
[10:06:17] <bawolff>	 That's really cool. I guess indexOf() would be similar