Why can I assign unknown properties to literal object in typescript?

Question

  type ExpectedType = Array<{ name: number, gender?: string }>

  function go1(p: ExpectedType) {

  }  

  function f() {
    const a = [{name: 1, age: 2}]
    go1(a)                   // doesn't complain
    go1([{name: 1, age: 2}]) // complain 'Object literal may only specify known...'
    go1(['no matter'].map(n => ({name: 1, age: 2}))) // doesn't complain
  }

The typescript code is as above, my question is that isn't the last three lines the same? Why the first line can pass and the second line get a complaint, and the third line get a pass?

Also on the typescript playground: playground

Answer 1

After some research, I found the answer is in TypeScript's document.

So the difference between the last 3 lines is that: The param in the 2nd line is object literally, while the other 2 not, TypeScript treat literally params and non-literally params differently:

Excess Property Checks