[FINoM]

devote,

Uncaught TypeError: Invalid property.  A property cannot both have accessors and be writable or have a value, #<Object>

Object.getOwnPropertyDescriptor ( ROOT.name.field, 'value' )
 → 
configurable: true
enumerable: true
value: "Jubilee"
writable: true

Тут нет сеттера, как видно.