No error accessing private property with indexed access

TypeScript Version: 3.1.0-dev.20180809

Code

class A { private n!: number; }
const a = new A();
const nameN = "n";
const n = a[nameN];

Expected behavior:

Error at a[nameN] just like for a.n.

Actual behavior:

No error.

This is an intended allowed bypass; see https://github.com/Microsoft/TypeScript/blob/master/doc/spec.md#413-property-access which outlines accessibility rules for a.x but not a["x"]

I wrote a linter rule to check accessibility of element access the same way TypeScript checks property access: no-restricted-property-access
For a description on how to use it, see https://github.com/fimbullinter/wotan/blob/master/packages/wotan/README.md

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