ts 2.3 -> 2.4 type predicate regression

[MarenkovIgor]

TypeScript Version: 2.4.1

testFindTypeGuard.ts:

let el: Element;

const nodes: Node[] = [];

const result = nodes.find((n): n is HTMLFontElement => n.nodeName === "FONT");

el = result;

my.d.ts:

interface Array<T> {
    find<U extends T>(predicate: (value: T, index: number, obj: Array<T>) => value is U): U | undefined;
}

Expected behavior:
Compiles fine (true for ts 2.1, 2.3)

Actual behavior: error TS2322: Build:Type 'Node' is not assignable to type 'Element'.
(tested with ts 2.4.1 and 2.7.0-dev.20171101)

[fictitious]

This appears to be the commit that changed inferred type for find from HTMLFontElement to Node

[MarenkovIgor]

fictitious, commit diff is too complex for me. Any suggestion, how fix the code?

[ahejlsberg]

Looks like a duplicate of #17451. @andy-ms can you verify?

[typescript-bot]

Automatically closing this issue for housekeeping purposes. The issue labels indicate that it is unactionable at the moment or has already been addressed.