Hi, Integers (and strings that can be cast to integers) on the first-level are always interpreted as index transforms in arrays (as documented <https://docs.djangoproject.com/en/dev/topics/db/queries/#key-index-and-path-transforms>) because you can store a JSON array in the JSONField. Unfortunately, you have to use a custom database function or RawSQL() to get this data. Please also take into account that KeyTransform() is an undocumented transformation (ticket #26511 <https://code.djangoproject.com/ticket/26511>).
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