This AI is still in early stages of development.
DATA_READONLY_HIDDEN_CONFIG
A non-enumerable, configurable, read-only data property.
Notes
The property will have the following descriptor:
Data property (a value)
Writable = false
Enumerable = false (hidden)
Configurable = true (can be changed)
Example
someObj.addProp(
DATA_READONLY_HIDDEN_CONFIG,
"foo",
"bar" // value
);