google / google/closure-compiler
Should `new Uint8Array(arr)` take `ReadonlyArray<number>` ?
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Description
Currently `TypedArray` constructors do not accept `ReadonlyArray` even though the `.from()` static method only requires `IArrayLike`. [Here is the constructor and the static method](https://github.com/google/closure-compiler/blob/c1e6f7dc87863d9491bc55b12380e08eb0e02216/externs/es6.js#L879-L906) for `Uint8Array` for instance. Is this intentional? Can we allow `ReadonlyArray` in the constructor?
If this is consistent with the intended typing and design, I will send a PR.
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