[epidemian]

> Particular to have cleaner diffs. But why for function calls?

Exactly the same reason :)

[koolba]

I suppose but that's usually an indication that an object would be more apt. If you have enough parameters that it needs to be wrapped, they're probably hard to track too.

[piezoney]

Well no, since you can use object destructuring.

const fn = ( { arg1 = '', arg2 = [], arg3 = true } = {} ) => { }

[scottmf]

But isn't this already valid with trailing commas?