Class with getter satisfies interface with mutable property

[SrTobi]

Consider the following code:

interface Base {
    prop: number;
}


class Impl implements Base {
    get prop(): number {
        return 3;
    }
}

let base = <Base>new Impl();
base.prop = 9;

This gives no error while compiling and even runs without any error/exception.
It should only work though, if prop was declared readonly in the Base.
Otherwise it should report that a setter is missing for prop.

May be a duplicate of #13347.

[mhegazy]

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