Proposal for an `Origin` object.

[mikewest]

What problem are you trying to solve?

Origins are the fundamental currency of the web's security model, and we work with them in a variety of APIs. However, we do so only as serialized strings: this can complicate comparisons, leading to security problems.

What solutions exist today?

Direct comparisons of serialized origins are straightforward. A variety of libraries exist that aim to enable more complicated comparisons; it's certainly possible to do so correctly in userland, if non-trivial.

How would you solve it?

https://mikewest.github.io/origin-api/ sketches an Origin object, with some additional examples and potential extensions in an explainer.

Anything else?

No response