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.

リンクされた TypeScript Playground で narrowing の動作を再現し、unknown について文書化されている動作と比較してください。any の equality narrowing における type-checker の経路を追跡し、その後、null と false が期待どおりに絞り込まれることを示す回帰テストのカバレッジを追加して、関連する compiler テストを実行してください。