Give `{}` some other type than `{}` so it doesn't cause subtype reduction problems with primitives

[xiaoxiangmoe]

TypeScript Version: 3.9.0-beta

Search Terms:
Array
Code

let a = [{a:1},1,2,3] // OK, Expected (number | { a: number; })[]
let b = [{},1,2,3] // Error,  Expected: `({}|1)[]` Actual: `{}[]`

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