Widget validation: `unique` constraint
Open
area: validation
kind: feature
pinned
- Dominant language
- JavaScript
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Description
Per discussion in #1035
**- Do you want to request a *feature* or report a *bug*?**
Feature.
**- What is the current behavior?**
There is no way to enforce unique constraints on collection fields.
**- What is the expected behavior?**
I propose a validation `unique` a la `pattern` to enforce unique constraints.
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