When I read fromSide I end up wondering which side. IMO uniform is clearer.

fwiw, I can see both sides of it (truly no pun intended) and don't feel strongly either way. I like both fromSide() and uniform().

Maybe fromUniformSide? Although that's getting back closer to where this all started. What do you think @jonahwilliams ?

fromBorderSide maybe?

The problem with uniform is that that means the same as all and it's not clear why you'd use one or the other from the name.

fromBorderSide is definitely unambiguous. +1 from me.

My understanding is that const is the disambiguator here - you use this one when you want a const version and are willing to explicitly provide a borderside rather than the individual properties that .all expects. But fromBorderSide is a bit clearer at least.

LGTM