This AI is still in early stages of development.
DATA_READONLY
An enumerable, non-configurable, read-only data property.
Notes
The property will have the following descriptor:
Data property (a value)
Writable = false
Enumerable = true (not hidden)
Configurable = false (cannot be altered once defined)
Example
someObj.addProp(
DATA_READONLY,
"foo",
"bar" // value
);