Ternary operator result not type checked correctly

[OliverJAsh]

TypeScript Version: 2.6.0rc, also 2.5.2

Code

{
    // expected error, got error
    const x1: { blur?: string } = { blur: 1 };

    // expected error, but got none!
    const x2: { blur?: string } = 'foo' ? { blur: 1 } : {};

    // expected error, got error
    const x3: { blur?: string } = (() => {
        if ('foo') {
            return { blur: 1 };
        } else {
            return {};
        }
    })();
}

Related to #14758?

[mhegazy]

Duplicate of #12745, fixed by #16363

[ahejlsberg]

@mhegazy I don't think this is fixed as you indicate. The issue here is that we reduce the type of 'foo' ? { blur : 1 } : {} to simply {} which then is assignable to { blur?: string }.

[mhegazy]

Sorry about that.. it is not fixed. Marking it as duplicate of #14758