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Polymorphic TypedArray methods return wrong type in subclasses
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**TypeScript Version:** 4.0.0-dev.20200519
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**Search Terms:**
typedarray subarray polymorphic
**Code**
```ts
class Buf extends Uint8Array {
foo() {}
}
new Buf(10).subarray().foo()
```
**Expected behavior:**
No error.
**Actual behavior:**
error TS2339: Property 'foo' does not exist on type 'Uint8Array'.
**Playground Link:** [Playground Link](https://www.typescriptlang.org/play/?ts=4.0.0-dev.20200518&ssl=1&ssc=1&pln=25&pc=26#code/MYGwhgzhAEBCCuAzaBTAHgFxQOwCYwFUBLbDADgEEAnKsAT2gG8BYAKGmkQHsuAKASiYBfNiNZtsKAO5wkvAIwAGfgDoI8AEZga9ASu59+QA)
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