Support for tc39/proposal-temporal

[Ucandoit]

Hello, I've recently encounted a problem with chai's deep equal assertion when an object contains a property of type Temporal.PlainDate. For example the following assertion does not result in error while it's not the same date.

expect({ name: 'a', date: Temporal.PlainDate.from('2022-05-30') }).to.deep.equal({
  name: 'a',
  date: Temporal.PlainDate.from('2022-05-31'),
});

The reason is that in deep-eql https://github.com/chaijs/deep-eql/blob/main/index.js#L197 the Temporal.PlainDate type is not managed since it's still in stage 3.
What's your opinion on making a PR to add the Temporal type comparison?
Otherwise do you have alternative solutions to make the comparison work?

[keithamus]

Sounds like a good idea! PRs welcome!