Broken behaviour with object property shortcuts and types union

[dfilatov]

TypeScript Version: 2.7.1

Code

type WithLoading = { loading: true; } | { loading: false; };

const loading = true;

const a: WithLoading = { loading };

Expected behavior:
No errors. And TypeScript 2.6.2 properly handles this case.
If I change the last line to const a: WithLoading = { loading: loading }; then there won't be any error, so it looks definitely like a bug.

Actual behavior:
Types of property 'loading' are incompatible. Type 'boolean' is not assignable to type 'false'.

Playground Link:
https://www.typescriptlang.org/play/index.html#src=type%20WithLoading%20%3D%20%7B%20loading%3A%20true%3B%20%7D%20%7C%20%7B%20loading%3A%20false%3B%20%7D%3B%0A%0Aconst%20loading%20%3D%20true%3B%0A%0Aconst%20a%3A%20WithLoading%20%3D%20%7B%20loading%20%7D%3B

[HyphnKnight]

It should be noted this applies to tuples as well as objects

type A = [true,string,string];
type B = [false,string]
const val:A|B = [false,'test'];

https://www.typescriptlang.org/play/index.html#src=type%20A%20%3D%20%5Btrue%2Cstring%2Cstring%5D%3B%0Atype%20B%20%3D%20%5Bfalse%2Cstring%5D%0Aconst%20val%3AA%7CB%20%3D%20%5Bfalse%2C'test'%5D%3B

[mhegazy]

Duplicate of #21436. should be fixed in typescript@next.

[typescript-bot]

Automatically closing this issue for housekeeping purposes. The issue labels indicate that it is unactionable at the moment or has already been addressed.