More than once I've found myself wanting to create a 'sentinel' value. The
most common use case is to differentiate between an argument that has not
been provided, and an argument provided with the value `None`.
This would be solvable by implementing something similar to what JavaScript
calls
> What functionality does such a thing actually need?
I think the requirements should be:
* The resulting symbol behave exactly like None. IE: the symbol should not
be an instance of object, but an instance of its own class
* A symbol can optionally be globally unique.
* Two symbols created by
@Nathaniel Smith:
> I think the name "symbol" here is pretty confusing. It comes originally
from Lisp
> The thing you're talking about is what Python devs call a "sentinel"
object.
Thank you for clarifying. I don't know much about Lisp, and I definitely
appreciate the historical context that
