Array members uniqueness

[florian-lefebvre]

I don't know is this is a bug or a feature, but given the example from the docs, keystatic doesn't prevent creating duplicated values.

tags: fields.array(
  fields.text({ label: 'Tag' }),
  // Labelling options
  {
    label: 'Tag',
    itemLabel: props => props.value
  }
)

Could be an option like { unique: true }