Support for ES2015 Map/Set

[mjackson]

Hey @ljharb!

From a quick scan of the source code, it doesn't look like you currently support ES2015 Map and/or Set objects (please correct me if I'm wrong) and I was wondering if you have any plans there. I'm currently using deep-equal to do equality comparisons in expect, but it doesn't look like they're keen to support them because they are only interested in comparing public API. But I thought you might be interested in supporting them since you're going for "conceptual equality".

Also, does this library work well with circular references?

If you do, I think I could possibly make the switch and close these two issues :)

mjackson/expect#47
mjackson/expect#50

Thanks!

[ljharb]

I definitely don't currently support it - you can Array.from/spread them to arrays, and compare them that way, and it should work great (assuming none of the keys/values are also collections), but I definitely should add support for generic iterables. It will require an additional dependency, but I don't think that's problematic.

As for circular references, I'm not really sure, but probably not - if you can file another issue referencing mjackson/expect#50 I can discuss/tackle that separately.

[ljharb]

Published as v1.3.0.