Partial<T> assignability error where T extends a compatible type

[Ghabriel]

TypeScript Version: 2.5.3 / playground

Code

interface Vertex {
    name: string;
}

function create<T extends Vertex>(): void {
    let x: Partial<T> = {
        name: "A"
    };
}

Expected behavior:
The code should compile, since every T will have name: string in its definition.

Actual behavior:
error TS2322: Type '{ name: "A"; }' is not assignable to type 'Partial<T>'.

[RyanCavanaugh]

This is a correct error. create<{ name: "B" }>() is a legal call that the function body fails to fulfill correctly

[Ghabriel]

The same error occurs if I change the Vertex definition to:

interface Vertex {
    name: "A";
}

In which case would the function fail with this definition?

[Ghabriel]

Found it: create<{ name: null }>(). Thanks, I'll close this issue.