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Previously, if we wanted to test if A was either 'B' or 'C', we would use
the pattern:
A in {B:1, C:1}
I actually don't know how common this pattern is; I just started using
it because I was tired of typing `A === 'B' || A === 'C'` all the time.
I never really liked it, though; the `:1` part made it kind of
blatantly a hack.
I did some testing and `['B', 'C'].includes(A)` is overall faster.
(A switch statement is around 20x faster still, but who wants to type
that much code?)
Anyway, the new standard is
['B', 'C'].includes(A)
Something something progress!
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