Readonly<TypedArray> lacks Symbol properties

[ghost]

Bug Report

🔎 Search Terms

readonly, missing symbol property, readonly typedarray

🕗 Version & Regression Information

• This is the behavior in every version I tried

⏯ Playground Link

Playground link with relevant code

💻 Code

const broken: Readonly<Uint8Array> = Uint8Array.of(1, 2, 3, 4);

broken[Symbol.iterator] // non-existant

const working: Uint8Array = Uint8Array.of(1, 2, 3, 4);

working[Symbol.iterator] // okay

🙁 Actual behavior

TS claims that Symbol.iterator and Symbol.toStringTag do not exist on Readonly.

🙂 Expected behavior

Code transpiled without error, Symbol.iterator has the same type on Readonly as it does on Uint8Array.

[MartinJohns]

Looks like a duplicate of #37182. Used search terms: readonly array symbol

[ExE-Boss]

This will be fixed by #42543