The antonyms of 'non-empty' could be:

  1. Empty
  2. Possibly empty

But I had not see it is being frequently used as "non-nullable", so I suspect there are some other synonyms of "possibly empty" exists. Why I find it I is ambiguity of "Possibly empty array". It could mean:

  1. Empty or non-empty array
  2. Empty or non-empty array, or anything else, e. g. string or number

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