scalar properties

[JosiahParry]

Many times I would like to use a class_string() or class_float() which would be a character and double scalar respectively. I think this is a very common use case.

Right now, we can use the rlang standalone type checks for making custom validators, but it would be exceptionally nice if these basic and common use cases were made available in S7.

If this is something that the maintainers of S7 would support, I would be happy to make a PR.

Related-ish issue: #412

[lawremi]

Are you referring to something like #433 ?

[JosiahParry]

@lawremi yes! Having a scalar property would be amazing. If there was one for the basic vector types—e.g. double, int, logical, factor, that would be beautiful

[lawremi]

Agreed, closing in deference to #433.

[JosiahParry]

I personally think the scope of #433 is more broad than this issue

[JosiahParry]

I'd also note that #433 is a PR and not an issue. It may be good to have an issue to track instead of the PR?

[lawremi]

Ok, I will re-open, with a slight clarification of the issue name to make it easier to find.