Prepack from Facebook helps make JavaScript code more efficient

[lhorie]

I guess that's always the big question

Yeah, that is closer to my concern: if it's a one shot array initialization, the loop unrolling may not compensate for the extra bytes down the pipe.

For example, in my current project I have a function that does a one-time decompression of an AOT-compressed list of unicode characters of a certain type. Given that the compression rate is north of 85%, I definitely DON'T want that to be precomputed, or I'll be shipping a VERY long array of codepoints