array spread into an object is incorrectly assignable to array types

[DetachHead]

Bug Report

🔎 Search Terms

spread object assignable to array

🕗 Version & Regression Information

Playground link with relevant code

💻 Code

const foo: string[] = []

//error: Type '{}' is missing the following properties from type 'string[]': length, pop, push, concat, and 26 more.
const bar: string[] = {}

//no error
const baz: string[] = {...foo}

//runtime error because its not an array
bar.push("")

🙁 Actual behavior

object is assignable to an array type

🙂 Expected behavior

error because the object does not have all the members of Array

[MartinJohns]

Duplicate of #43977. Used search terms: object spread array in:title