NumberFormat: new style scientific

[ray007]

ICU number formatting has an option for scientific formatting which would be nice to have in NumberFormat too.
Needs #163 first.

[darknoon]

Funny timing, I was just coming here to ask for this / start a proposal and saw this issue opened. 🕺🏻

[caridy]

We need to format proposal, and a champion :)

[sffc]

See my follow-up in #215

[anba]

The new notation option allows to specify a "scientific" output style.

js> print(new Intl.NumberFormat('en', { notation: "scientific" }).format(1000))
1E3

[sffc]

Yep, the proposal is Stage 4 and merged. Closing as Fixed