AbstractRNG should be a broadcast scalar

[stevengj]

As mentioned on the mailing list, we need a

Base.broadcastable(x::AbstractRNG) = Ref(x)

somewhere.

Not breaking since trying to a broadcast an RNG currently gives an error.

[JeffBezanson]

I think we have too many of these definitions already. At a certain point it's just better to be explicit. It's not obvious, for example, whether an RNG is iterable.

[stevengj]

It's not obvious, for example, whether an RNG is iterable.

Why would an RNG be iterable? This seems like one of those things that will never have a length.

[JeffBezanson]

It's just that an RNG is an obscure enough object that being explicit seems acceptable to me.

[stevengj]

My feeling is that every documented type that is unambiguously not sensible to treat as a collection should implement Base.broadcastable(x::Foo) = Ref(x).

Is there a downside to having "too many" such broadcastable definitions?