https://tc39.es/proposal-intl-messageformat/#sec-intl.messageformat.prototype.resolvedoptions

i. Perform ! CreateDataPropertyOrThrow(options, p, v).

and in
https://tc39.es/proposal-intl-messageformat/#sec-properties-of-intl-messageformat-instances

[[MessageData]] is an Object conforming to the JSON Schema definition of the Unicode MessageFormat 2.0 specification.

where it came from
https://tc39.es/proposal-intl-messageformat/#sec-initializemessageformat
2. Let msgData be ? GetMessageData(source).
and
8. Set messageFormat.[[MessageData]] to msgData.

but why do we need to returnt this parsed JSON object in resolvedOptions()? what is the use case for this ? Why it cannot be just in internal representation or keep it as the input String but need to be return as a JSON object?