uiconfig.js
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    Type Alias PrimitiveVal

    PrimitiveVal:
        | string
        | number
        | boolean
        | null
        | PrimitiveValObject
        | PrimitiveVal[]

    Primitive value type. It can be a string, number, boolean, null, an object that implements the PrimitiveValObject interface, or an array of primitive values.

    note that arbitrary objects are not allowed, only arrays