Weird behaviour with return type of function intersection

[rancid gyro]

Can anyone help me understand the differences in types in this code?

type FN1 = () => string | number
type FN2 = () => number

type R1 = ReturnType<FN1 & FN2> // number
type R2 = ReturnType<FN2 & FN1> // string | number

const res1 = (undefined as unknown as (FN1 & FN2))() // string | number
const res2 = (undefined as unknown as (FN2 & FN1))() // number

[solemn island]

bennie#5947

Playground Link

Preview:```ts
type FN1 = () => string | number
type FN2 = () => number

type R1 = ReturnType<FN1 & FN2> // number
type R2 = ReturnType<FN2 & FN1> // string | number

const res1 = (undefined as unknown as (FN1 & FN2))() // string | number
const res2 = (undefined as unknown as (FN2 & FN1))() // number
...```

[bitter raven]

generics (like ReturnType) use the last overload (or last member U of an intersection T & U); overloads use the first matching overload/union member