Sorry to be pedantic, but `[,,,]` creates holes instead of undefined. They are different, because for example `[,,,].forEach(() => console.info(1))` doesn't do

Sorry to be pedantic, but `[,,,]` creates holes instead of undefined. They are different, because for example `[,,,].forEach(() => console.info(1))` doesn't do anything, but `[undefined,undefined,undefined,].forEach(() => console.info(1))` prints three "1"'s.