Update index.js

[GoldenCookieGIT]

not false

[mde]

While this is indeed true (or true) in a reverse-tautological fashion, I do have some concerns about the increased overhead of the bang-operator usage. We would need to do some extensive performance benchmarks to determine the viability of such an approach. I'll close this PR for now, but let's resurrect it once we have run all the appropriate and extensive benchmarks necessary for such a major change.