Use Intl.Segmenter when available?

[sindresorhus]

Investigate using https://github.com/tc39/proposal-intl-segmenter when/if it becomes available.

new Intl.Segmenter('en', {granularity: 'grapheme'});

[Richienb]

By using a ponyfill as a fallback when Intl.Segmenter is not available, it is possible to split a string by each character: https://github.com/Richienb/split-chars

[sindresorhus]

I don't want to bring in a polyfill and all the potential problems and bloat that comes with that. The current code works ok, so we can just wait until it becomes available in Node.js.

[Richienb]

Ok. Looks like Intl.Segmenter will be available in Node.js 16.

[Mini-ghost]

Should we mention in the Readme that FireFox does not currently support Intl.Segmenter? After all, this API is being used in the source code.