[tym0]

Do you still have to pass every args as json/strings or has there been an improvement on that front?

[balloob]

This has never been the case. Custom elements are DOM Elements and so are just JavaScript objects. Just like you can do aEl.disabled = true, you can set any prop to any type of value.

[gedy]

I think they mean in the markup via <some-tag data={anObject}> ala React, svelte, etc.

[lloydatkinson]

It's still exactly like that.