Type guard/Equality narrowing doesn't work on "any"

Bug Report

🔎 Search Terms

type guard equality narrowing strict equal equality

🕗 Version & Regression Information

• This is the behavior in every version I tried, and I found earlier issues (https://github.com/microsoft/TypeScript/pull/9407 and the PR that added this feature https://github.com/microsoft/TypeScript/pull/9407)

⏯ Playground Link

https://www.typescriptlang.org/play?#code/FAMwrgdgxgLglgewgAgEYEMBOAKZWDmAXHhAJ7ICUyA3sMvcnCMrgcgLyfIRgA2vlGnQYjMAUxhhMKAgG5h9AL7AFjZq0z4OXEOl4BnMYNojREqTM3yRy5SqA

💻 Code

function bar( arg: any ) {
    if ( arg === null ) {
        return arg;
    }

    if ( arg === false ) {
        return arg;
    }
}

🙁 Actual behavior

arg should be null/false inside the if conditions

🙂 Expected behavior

arg is any

The docs say this should work https://www.typescriptlang.org/docs/handbook/2/narrowing.html
When using unknown instead of any it works perfectly fine. I think adjusting this, so it works for any too, isn't too far fetched.

Reproduce el comportamiento de narrowing en el TypeScript Playground enlazado y compáralo con el comportamiento documentado para unknown. Sigue la ruta del type-checker para el equality narrowing de any; después, añade cobertura de regresión que muestre que null y false se estrechan como se espera y ejecuta las pruebas relevantes del compilador.