Well, I for one have a list of aliases for a page name, so that it might have multiple.
Sent from my iPhone > On May 29, 2019, at 6:28 PM, Matthew Butterick <m...@mbtype.com> wrote: > > tl;dr > > 1) Would it be useful to allow meta values to be expressions, not merely > datums? > 2) Is anyone using identifiers or lists as meta values? Mostly my impression > is that they're usually strings, numbers, or booleans (whose meaning wouldn't > change with this upgrade). > > > > I was thinking that it would be easy to make meta values expressions rather > than datums, so that something like this: > > ◊(define-meta foo (* 6 7)) > > Means that the `foo` meta is 42. > > You could, in theory, run anything you wanted there: > > ◊(define meta bar (let () (local-require every/module) (do-a-zillion-things)) > > This isn't quite backward-compatible. Datums that are self-quoting, like > strings, numbers, and booleans, are the same under either system. > > But things that look like evaluatable expressions — especially naked > identifiers and lists — would be different. > > ◊(define-meta id bar) > > Today, this results in a meta value of `'bar`. But if meta values are treated > as expressions, it would just be `bar`, and trigger an unbound-identifier > error. > > Or again consider: > > ◊(define-meta foo (* 6 7)) > > Today, this results in a value of `'(* 6 7)`, but it would not under the new > system. > > I can't really tell, however, whether the theoretical benefits outweigh the > theoretical costs. > > -- > You received this message because you are subscribed to the Google Groups > "Pollen" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to pollenpub+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/pollenpub/F1382F41-83DC-4864-8DEA-2D919DA7976F%40mbtype.com. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "Pollen" group. To unsubscribe from this group and stop receiving emails from it, send an email to pollenpub+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/pollenpub/97807D6C-B2CB-4503-B02B-5F66435285EC%40gmail.com. For more options, visit https://groups.google.com/d/optout.
