Example in 8.2 confusing

[Dreamsorcerer]

I can't understand the examples given in section 8.2:

// bad
[1, 2, 3].map((number) => `A string containing the ${number}.`);

// good
[1, 2, 3].map((number) => `A string containing the ${number + 1}.`);

Why is the first bad, and the second good? Neither have side-effects, so surely both are good?

[ljharb]

That looks to have mistakenly added in 820745d#diff-04c6e90faac2675aa89e2176d2eec7d8R963-R965 / #1863, probably a bad rebase. I'll clean it up.