Make duck-typing optional.

[zpdDG4gta8XKpMCd]

I wish I could turn duck-typing off sometimes because it leads to bugs that very hard to detect.

For example:
Suppose I have 2 interfaces with the same surface but completely unrelated sematics:

interface Chicken {
   id: number;
   name: string;
}

interface JetPlane {
   id: number;
   name: string;
}

then doing the following is completely fine in TypeScript:

var chicken : Chicken = { id: 1, name: 'Thomas' };
var plane: JetPlane = { id: 2, name: 'F 35' };
chicken = plane;

I wish there was an option to prevent such assignment from being valid.

[samwgoldman]

This is a duplicate of #202.

[RyanCavanaugh]

Agreed