Object Literal + spread + public property

[unional]

Sorry about the title. Can't think of a good way to describe the issue. Feel free to modify it.

Here is the issue:

class Foo {
    do() { }
}
class Boo extends Foo {
    public x: number
}
function foo(f: Foo) { return f }
const boo = new Boo()

// Argument of type '{ x: number; }' is not assignable to parameter of type 'Foo'.
//  Object literal may only specify known properties, and 'x' does not exist in type 'Foo'.
foo({ ...boo })

playground link

[ghost]

In addition to the extra property, spreading an object removes methods. So foo({ ... new Foo() }) would also fail.

[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.