Error with combining Array types? Error: Cannot invoke an expression whose type lacks a call signature

[khusamov]

TypeScript Version: 2.2.1

Code

function getHandler(handlers: number[] | string[]): any {
    return handlers.map(handler => handler);
}

Expected behavior:
Without error!

Actual behavior:
Error text:

error TS2349: Cannot invoke an expression whose type lacks a call signature.
Type '{ (this: [string, string, string, string, string], callbackfn: (value: string,
index: number, ...' has no compatible call signatures.

[mhegazy]

Duplicate of #7294

[mhegazy]

This issue seems to have been already addressed or is unactionable at the moment. I am auto-closing it for now.