Fix unexpected use of undefined with Boolean()

Airbnb style guide recommends checking booleans this way or using
(!!window.FormData). The latter is more confusing for many.

While !! is indeed 0.2% faster than Boolean(), it's called
micro-optimization. There is no noticeable difference to the user in our
use scenario and I prefer more readable code any day.

Fixes ESLint no-undefined warning using Airbnb ES5 config.

Reference: https://jsperf.com/boolean-conversion-speed

0 files changed, 0 insertions, 0 deletions