Suggestion: Tuple literal may only specify known properties

[ghost]

TypeScript Version: nightly (2.2.0-dev.20161116)

Code

const p1: { x: number, y: number } = { x: 0, y: 1, z: 2 };
const p2: [number, number] = [0, 1, 2];

Expected behavior:

Errors on both lines.

Actual behavior:

Only the first line has an error.

[mhegazy]

looks like a duplicate of #6229

[ghost]

I don't know -- even if using a non-exact tuple type, it still seems like it would be useful to report an error in the case of a tuple literal with an extra property. Similar to the relationship between object excess property checking and exact types (#12936).