A stdlib implementation is a whole lot easier and less disruptive than new syntax in core. This counts for a lot. But of course you're vastly more limited in wh

A stdlib implementation is a whole lot easier and less disruptive than new syntax in core. This counts for a lot. But of course you're vastly more limited in what you can do. The main benefit of this proposal that i can see is not the specific functionality it provides, but simply the fact that it makes it clear and explicit that this is a set of constants that have some meaning to the module - putting such constants in ordinary classes/namespaces (along with everything else) can obscure the fact they are not variables/attributes.