Type of object spread properties is incorrectly inferred with strictNullChecks

[MartinJohns]

TypeScript Version: 2.7.1

Search Terms:

• partial
• strictNullChecks
• undefined

Code

interface User {
    name: string;
}

const user: User = { name: 'Bob' };
const partial: Partial<User> = { name: undefined };
const result = { ...user, ...partial };

type ResultName = (typeof result)['name'];

Expected behavior:
Type ResultName is string | undefined.

Actual behavior:
Type ResultName is string.

Playground Link:
https://www.typescriptlang.org/play/#src=%0D%0Ainterface%20User%20%7B%0D%0A%20%20%20%20name%3A%20string%3B%0D%0A%7D%0D%0A%0D%0Aconst%20user%3A%20User%20%3D%20%7B%20name%3A%20'Bob'%20%7D%3B%0D%0Aconst%20partial%3A%20Partial%20%3D%20%7B%20name%3A%20undefined%20%7D%3B%0D%0Aconst%20result%20%3D%20%7B%20...user%2C%20...partial%20%7D%3B%0D%0A%0D%0Atype%20ResultName%20%3D%20(typeof%20result)%5B'name'%5D%3B%0D%0A

Related Issues:
#14799

[mhegazy]

Seems like a duplicate of #13195

[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.