Array(n) is spreaded incorrectly in arrays

[zuzusik]

TypeScript Version: 2.1.6

Code

[...Array(5)]

Expected behavior:
Array filled with undefined 5 times (this is how it should be by the spec and how Chrome/FF/Safari do it)

Actual behavior:
Empty array with length set to 5

[alex3165]

Typescript compile it to Array(5).slice(); https://www.typescriptlang.org/play/#src=%5B...Array(5)%5D%0D%0A

[zuzusik]

@alex3165 yes, it does, and this is wrong because it gives non spec compliant result

[alex3165]

@zuzusik Agreed, it is not really expected

[mhegazy]

Duplicate of #8856