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String enums have reverse mapping #16761

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TypeScript Version: 2.4.0 / nightly (2.5.0-dev.20170627)

In the PR for string enums it is said they do not have reverse mapping. When I compile the following I get a different output from the shown in the PR. Is this a change?

Code

enum ActionType {
    AddUser = "ADD_USER",
    DeleteUser = "DELETE_USER",
    RenameUser = "RENAME_USER"
}

enum Mixed {
    A,
    B,
    C = "hi",
    D = 10,
    E,
    F = "bye"
}

Expected behavior:

var ActionType;
(function (ActionType) {
    ActionType["AddUser"] = "ADD_USER";
    ActionType["DeleteUser"] = "DELETE_USER";
    ActionType["RenameUser"] = "RENAME_USER";
})(ActionType || (ActionType = {}));

var Mixed;
(function (Mixed) {
    Mixed[Mixed["A"] = 0] = "A";
    Mixed[Mixed["B"] = 1] = "B";
    Mixed["C"] = "hi";
    Mixed[Mixed["D"] = 10] = "D";
    Mixed[Mixed["E"] = 11] = "E";
    Mixed["F"] = "bye";
})(Mixed || (Mixed = {}));

Actual behavior:

var ActionType;
(function (ActionType) {
    ActionType[ActionType["AddUser"] = "ADD_USER"] = "AddUser";
    ActionType[ActionType["DeleteUser"] = "DELETE_USER"] = "DeleteUser";
    ActionType[ActionType["RenameUser"] = "RENAME_USER"] = "RenameUser";
})(ActionType || (ActionType = {}));

var Mixed;
(function (Mixed) {
    Mixed[Mixed["A"] = 0] = "A";
    Mixed[Mixed["B"] = 1] = "B";
    Mixed[Mixed["C"] = "hi"] = "C";
    Mixed[Mixed["D"] = 10] = "D";
    Mixed[Mixed["E"] = 11] = "E";
    Mixed[Mixed["F"] = "bye"] = "F";
})(Mixed || (Mixed = {}));
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