fix: simplified map+flat

[Connormiha]

I did a little optimization .map + flat can be replaced by single flatMap.

[bpasero]

Assigning to the using-new-JS-features-authority ;)

[jrieken]

Generally this can be used but AFAIK know (and the last time we checked) it is significant slower

[jrieken]

AFAIK know (and the last time we checked) it is significant slower

I might be mistaken and confuse it with Array.from(arrayLike, mapFn)

@Connormiha Can you check with a simple test on https://jsbench.me

[Connormiha]

https://jsbench.me/55ln95lw4j/1

[jrieken]

Thanks! I see Chrome more or less the same, Safari ~30% faster (using flatMap), and FF ~10% slower. Always a surprise but I'd say we take it