Solved self::LIST_COMMA used with user-groups without "list" attribute

[Xon]

Both AbstractField and AbstractPrefix implement user-group lists for allowed/editable lists, which are a type hinted on the entity as a list integers. The backing store uses Entity::LIST_COMMA/self::LIST_COMMA which will return a list of strings.

Using 'list' => ['type' => 'int', 'unique' => true, 'sort' => SORT_NUMERIC] in the column definition means the integer nature will be preserved and saved into json caches as expected.

This is most relevant if trying...

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