Field Sequence
Add a macro (probably called sequence) like
field count -> [field] (assert (= length [field] count))
That should help reduce boilerplate where the user needs to enter many units of the same field.
This is...
So, for starters, checkbox-set and radio-set exist. Also, textarea, select, multi-select and recaptcha aren't typically present in numbers. That leaves, maybe, text (since I doubt anyone will want a user to confirm a password 17 times). In other words, I can solve this problem by implementing text-set instead of a generic sequence shortcut for define-field.
On the other hand, it wouldn't be terribly difficult, and it wouldn't hurt in any obvious way (since it'll get unfolded at definition time, rather than at view time).