[cygned]

> I'm not sure what "spreading" even refers to

We have code like (stupid example)

    something.map( {a, b, ...rest} => ({ ...rest, ...a, ...[b, c, d]}))

I know what it does and how it works, but I argue that's hard to understand if you haven't written it and know the context.

My Python experience is limited to only a handful of projects, but I looked into meta classes at the beginning of learning Python and that was some crazy stuff.