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Array.concat() 's params wrong!!! #17447

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@scp1513

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@scp1513

TypeScript Version: 2.4.1

Code

let a: ReadonlyArray<number> = [];
let b: number[] = [];
// compile error
let c = b.concat(a);
// you see Array.concat() doesn't change the params

Expected behavior:

Actual behavior:

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