`Exclude<Exclude<T, null>, undefined>` is not assignable to `Exclude<T, null | undefined>` and vice versa

TypeScript Version: Nightly

Search Terms:
typescript nullness inference

Expected behavior:
They should be assignable to each other.

Actual behavior:
They are not considered assignable to each other.

Type 'Exclude<Exclude<T, null>, undefined>' is not assignable to type 'Exclude<T, null | undefined>'.
  Type 'Exclude<T, null>' is not assignable to type 'Exclude<T, null | undefined>'.
    Type 'T' is not assignable to type 'Exclude<T, null | undefined>'.(2322)

and

Type 'Exclude<T, null | undefined>' is not assignable to type 'Exclude<Exclude<T, null>, undefined>'.
  Type 'T' is not assignable to type 'Exclude<Exclude<T, null>, undefined>'.(2322)

Related Issues:
N/A

Code

export function f<T>(v: Exclude<Exclude<T, null>, undefined>) {
    const w: Exclude<T, null | undefined> = v;
}

export function g<T>(v: Exclude<T, null | undefined>) {
    const w: Exclude<Exclude<T, null>, undefined> = v;
}

export function f(v) {
    const w = v;
}
export function g(v) {
    const w = v;
}

{
  "compilerOptions": {
    "noImplicitAny": true,
    "strictNullChecks": true,
    "strictFunctionTypes": true,
    "strictPropertyInitialization": true,
    "strictBindCallApply": true,
    "noImplicitThis": true,
    "noImplicitReturns": true,
    "useDefineForClassFields": false,
    "alwaysStrict": true,
    "allowUnreachableCode": false,
    "allowUnusedLabels": false,
    "downlevelIteration": false,
    "noEmitHelpers": false,
    "noLib": false,
    "noStrictGenericChecks": false,
    "noUnusedLocals": false,
    "noUnusedParameters": false,
    "esModuleInterop": true,
    "preserveConstEnums": false,
    "removeComments": false,
    "skipLibCheck": false,
    "checkJs": false,
    "allowJs": false,
    "declaration": true,
    "experimentalDecorators": false,
    "emitDecoratorMetadata": false,
    "target": "ES2017",
    "module": "ESNext"
  }
}

Playground Link: Provided

Commencez par le lien Playground fourni et les fonctions génériques f et g avec les options strictes du compilateur indiquées. Suivez la manière dont le compilateur vérifie les deux types Exclude imbriqués, puis vérifiez que les deux affectations sont acceptées sans les erreurs TS2322 signalées, tout en conservant la sortie générée affichée.