Object.hasOwn()

[tobiu]

I kind of missed this one :)

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwn

we can now replace all occurrences of Object.hasOwnProperty() with hasOwn().

MDN recommends to do so, the bundle sizes get a bit smaller and the browser and nodejs support is decent.

[tobiu]

well, actually it is not true for the bundle size, since we can call hasOwnProperty() directly on objects, while hasOwn() has to get called on Object. still, we should do it.