Type of heterogeneous enum value can't be inferred correctly when used in object literal

TypeScript Version: 3.5.3

Search Terms:
heterogeneous enum value type

Code

const enum Heterogeneous {
  Foo = 1,
  Bar = 'zzz',
}

var a1: string = Heterogeneous.Bar; // <= OK. no error.
var a2: {name: string} = {name: Heterogeneous.Bar}; // <= Type 'Heterogeneous' is not assignable to type 'string'.

var b1: Heterogeneous = Heterogeneous.Bar; // Type of 'b1' is 'Heterogeneous'.
var b2 = {name: b1}; // Type of 'b2' is still inferred as '{name: Heterogeneous.Bar;}'
var b3: {name: string} = {name: b1}; // OK. 'Heterogeneous.Bar' is assignable to 'string'.

Expected behavior:
no error.
Actual behavior:
var a2: {name: string} = {name: Constants.Bar}; // <= Type 'Constants' is not assignable to type 'string'.ts(2322)

I often use a heterogeneous const enum as a constant provider, for compile time optimizing.
Specifying the string type literal explicitly will work, like:

var a2: {name: string} = {name: <string>Heterogeneous.Bar};

but it looks verbose.

まず、issue にある heterogeneous const enum と object-literal の例を使って、報告された TypeScript 3.5.3 の動作を再現します。直接の enum メンバー、型注釈付きの変数、推論されるオブジェクトについて、推論された型と代入エラーを比較します。完了の条件は、直接のオブジェクトリテラルへの代入で、明示的な型アサーションなしに文字列値のメンバーを受け入れ、既存の推論動作が正しいままであることです。