strictNullCheck does not flag unassigned readonly property

[msterba]

TypeScript Version: 2.0.0 with --strictNullCheck

class My {
    readonly prop: string;
    dump() {
        console.log(this.prop);
    }
}

Expected behavior:
Expected a compiler error ('undefined is not assignable' or 'unassigned before use') as this.prop is undefined

Actual behavior:
Compiles without complaints and loggs undefined.

[RyanCavanaugh]

Duplicate of #8476 and #9863 and #9797 and #9773 and #9761 and #9131